i know alot of people buy their supplies at
PetEdge.com Wholesale prices on exclusive dog grooming and pet supplies 
we like petzlife products for teeth bushing/maintenance
PetzLife Products Inc - Products For a Healthier Pet 
you will need:
a good pair of shears(scissors)
clippers/trimmers.
brushes.
combs.
shampoo/conditioner.(we like minksheen shampoo & pantene conditioner)
leave-in detangler.(ice on ice)
nail trimmer/file & quik stop.
also.. i know you can go to a beauty supply (or somewhere that sells professional tools).. & purchase shears & clippers there! i know target/wal mart have trimmers/clippers(i don't know much about these sorry.)
*(there is a sticky that Marci (marcella02) posted on grooming)
http://www.yorkietalk.com/forums/yor...cerella02.html
*you can do a search on here for more specific areas of grooming..
*youtube.com has videos on grooming & there are also a few people on here who have bought grooming dvds/books..
Good Luck! im sure people will chime in and add to the list of things you will need!