Our puppies are well on their way to being potty trained when they go to their new homes.
Shown is an artificial grass potty with "step" for the little puppies to climb back up in their cage.  The step is made of a storage container filled with rocks to weigh it down (your puppy will not need a step).  We recommend the Pet Loo by Pet Safe, you can get it on Amazon, etc.

Collar and Leash typically the x-small size collar will fit your puppy from the time he goes home with you until he is finished growing.  Typically a size 6 to 10 fits an adult well.  Do not buy a cat-collar as I did because they are small.  They are made to break open and if your dog "jerks" on the leash, he could easily break free.  This is pretty scary when there is a lot of traffic in the area!  A 4 foot or 6 foot leash is good.
Flexi Leash These are really nice for taking the puppy on a long walk or out in your yard for some running exercise if you do not have a fenced area.  Also good for allowing the dog a little "privacy" distance from you while pottying.  Just remember to keep the leash short and locked when in the company of other dogs.
Crate, approx. 17x24x20 I personally prefer the wire crates, but the enclosed plastics are just a good.  If you have an upstairs bedroom, I recommend buying two crates so you don't need to carry one back and forth. 
Travel Crate or Bag so puppy can go with you most of the time.  I really like the Wheel Away brand carriers.  I have seen them at Target recently.  When you travel, remember to bring bottled water and a roll of paper towels "just in case".
Crate Pad and Snuggle Blanket (I recommend at least two so you can have one while washing the other)
X-Pen, from a dog supply store or a baby store.  Not a requirement, but many people have found these to be very useful for the first year.  It allows you to set up a space where the puppy is safe and secure, has room to move around and play with his toys and sleep.  Add a litter box and he has a place to eliminate if you are gone for a long time.  Always provide water and food if you like.
Baby Gate, to block off areas of the house from your puppy.  The first couple of months, he should only have  access to one or two rooms, gradually increase his freedom area.
Food and Water Dishes, choose your favorite; glass, metal, plastic, ceramic
Water, we recommend bottled water for the first week, slowly mixing in your own water.  A change in water often gives a puppy diarhea.  Keep this in mind when you travel and always use bottled water for your dog.
Food, we prefer Rachel Ray's Nutrish for puppies, or ProPlan Focus Puppy, or ProPlan Small Breed Puppy, or any other good quality food.  Again, if you wish to change food, slowly mix the new food with the old to avoid stomach upset.
Treats, always think "Cheerios" or smaller when offering a treat to your puppy.  Cheerios and other cereals are acceptable treats.  Keep in mind the amount of treats you have given your dog along with his food so you do not over-feed.  Green beans and carrots are good treats.  When training, I use tiny bits of hotdog, cheese, chicken, beef, etc.  It's a good idea to think of treats in "value order", a Cheerio is much less valuable than a piece of liver.  Start your training with lower-value treats.  Always make your dog earn his treat - sit, spin, speak, kennel, etc. 
Foods to avoid, chocolate, grapes and raisins are very toxic, also stay away from onions and use garlic in small amounts. 
Artificial Grass Pan if you intend to continue offering this method to your puppy.  (It comes in very handy during inclement weather.)  Also, it makes life much easier if you can offer an x-pen with a potty box to your dog, especially if you are gone for more than a couple of hours. 
Litter Pan and LitterThe product we use is Second Nature by Purina.
Toys, what can I say here?  I love to buy new toys for the dogs.  Remember to look in the infant department of your local store to find great, and safe, puppy toys.  Stuffed animals with stitched eyes, etc are best.  Infant "pop beads" are great.  There are now "educational" toys available for dogs which help them learn to think and work out puzzles.  My favorite brand is "Petstages" - great quality and variety.
Bed  My puppies love to snuggle up in the round beds and we always have several scattered in the living room for them.  I'll admit it, I'm a bed-junkie.  I have lots of them!

More Supplies for Grooming...
Pin Brush You need to brush/comb your dog every day.  In the beginning so he will get used to it, and continue every day until he has finished losing his puppy coat; if you don't brush every day during this process, your dog will become severely matted.  Once the dog has his adult coat, you may continue to brush daily, and change to every other day and still have a nice coat.
Comb  I prefer a metal comb with medium and fine tines.  A small comb or a flea comb is great for getting the debris that collects in the corner of the eyes.
Nail Clippers style of clipper is a matter of personal preference.  I use regular "people" toenail clippers for the babies, then use the guillotine type as they get older.
Quick Stop or flour or corn starch - something to stop the bleeding if you happen to cut a little close on the toenail
Tooth Paste and Brush you should begin early to teach your new puppy to have his teeth brushed once or twice a week.  You must use dog toothpaste as human toothpaste is not good for their digestive system.
Scissors or Small Razor to trim the hair that grows between the pads on his feet
Hair Clips, Barrettes or Bands to keep the hair back and out of the puppy's eyes.  The hair irritating the eyes causes excessive tearing.  Of course, there is a stage when it needs to be pulled back, but isn't quite long enough; hair spray or gel helps during this time and even later.
Shampoo can be a dog shampoo or a "people" shampoo (Panteen) ; I use a variety of them.  Be sure to rinse all shampoo out thoroughly.  I like to keep an empty 16 oz. bottle handy so I can put about 2 ounces of shampoo and fill up with warm water, shake well, and use this as your dog shampoo.  The shampoo lasts a lot longer, and it is easier to apply to the cog's coat.  Because this helps you use less shampoo at each washing, it is easier to rinse out before applying your conditioner.  Some of my favorite brands are:  Vellus, Best Shot, Nature's Specialty, Pet Silk, and Plush Puppy - all available on the internet.
Conditioner always use a good conditioner on your Havanese each time you bathe him/her.
Detangler there are many detangler products on the market; most of them are a little oily and you will probably want to shampoo again in a few days after using one of them.
Fine Mist Spray Bottle for watered-down conditioner to use when you comb or brush between shampoos.

Plastic Baby Play Pen from Baby World used as an x-pen
Metal x-pen from pet store
Memzy says that beds are not just for sleeping, you know!
An excellent grooming book published in late 2008, compiled by the Havanese Fanciers of Canada
A "must-have" if you groom your own Havanese
A litter pan is a good alternate choice for an indoor training potty.
Rachel Ray's Nutrish Puppy Food