Cats are pretty low maintenance pets. You'll want flea/tick prevention and your basic core vaccines. Find a local veterinarian to perform annual exams and get a baseline on your cat's health. Becoming an established client with a veterinary clinic/hospital is very important to your cat's health and well being. You don't want to be scrambling to find a vet when you have an emergency!
It is suggested to have one more litter box than number of cat(s) in your household. I've used pine pellets in the past. They worked just fine. I think litter choice really comes down to you and your cat's preference. I personally do not like scented, clumping litter--but that's just me--you could find it perfect for your needs.
I highly recommend a water fountain. It's not a necessity, but most cats love it! Buy the best food you can afford, I would suggest staying away from foods with added colors (dyes) because this can lead to tummy upset which can then lead to accidents.