You'll Love showing! Now im assuming that this will be a kitten, and if it's not then you cans till use some of this info, but you have to remember that it could very well be that an older cat may not like showing. First thing is Love them to death, and play with them often, using a few different kind of teasers. You never know what kind of treaser a judge will use, and you don't want him/her to be scared off. You might want to get them use to being handled like a judge will handle them ie. feeling their head, checking the boning, strecthing the body, everything that a judge would do.
Get him/her used to having a bath and grooming, so you want to start this as early as possible! You dont always have to use shampoo, just get them used to the water and the whole process.
Most of all, get your family, friends and such to handle him/her so that they get used different people. Rememeber though, you can do all of this and still end up with a kitty that doesn't like to show, and you'll know if that happens.
If you need anything else don't hesitate to ask.
BTW, what association are you showing with?