It's kind of a touchy subject with some people as they feel that Bs should be left as natural as possible but.. this is what I do.
-Bath with White on White (chris christensen) and Plush Puppy - Natural All-Purpose Shampoo with Henna. I bathe him a few days before.
-Dremel nails
-Trim tail, ears and any little fly away hairs. I use tiny clippers because I'm clumsy with scissors. Some people use thinning shears or curved scissors.
-I trim whiskers.. not everyone does
-I chalk him a little bit but not all the time. He's pretty white and doesn't really need it and I hate doing it. I watched the breeder do it a few times and now do it on my own. It's important not to overdo it. You don't want the judge (or yourself!) covered in chalk.
-Spray with Plush Puppy's finishing spray
I've seen some exhibitors do more than that.
I would contact your breeder to see how they like their dogs done and see what products work for their dogs. With my first dog I just bathed, trimmed tail/whiskers and dremeled his nails and we did just fine!