Already a ton of great suggestions, a few I can add to:
-What size/brand of crate is best?
Personal preference really. I have wire crates, plastic vari kennels (ones I use most often and with the majority of the dogs - medium size) and some soft sided ones I use for hotel rooms - depending on the dog.
-How about an ex-pen?
covered
-What type/size of bowl?
Stainless or ceramic; pint size. Plastic - they can chew up and will sometimes cause contact allergies.
-What style/size of collar and leash? (As an aside, I was actually in Petco the other day. Our lab used to have a choke-style collar, but made of soft nylon...it was great for training and very comfortable on her because it wasn't bulky - she was fidgety as a puppy if we put a collar with a buckle on her, but never with this style of collar. Petco didn't have ANY of these! Are they a rarity now? Is there something bigger and better out there?)
-Does your dog have a separate pet bed?
Collars, try starting with the flat buckle. The soft nylon choke-styles are still around, either vendors at dog shows or catalogs will be your best source for those. There are also the martingale style collars which slip over the head, have adjustability like the flat buckles, but also correction ability like the choke-styles. (I LOVE them.) Sight hound people use them A LOT and sometimes they are known as Greyhound collars. PetsMart carries these. Vet's offices that carry the Lupine brand will have them. Another line for them is Premier. The Halti, IF leash training goes well in the beginning, you probably won't need one of those. Just depends on the puppy/dog a lot. Some are worse about pulling than others, and a Halti is a good training tool to help break them of that.
Debbie