If you get the kitten or cat at a rescue place, they will give you instructions. It really doesn't cost much to have a cat (especially if it is an indoor cat, which is highly recommended). You will need to have a kitty litter box, scoop and litter. Scoopable is the best. I get mine at bjs. For food, they really don't eat much. I feed mine friskies dry and also the wet food. For toys, you can pick them up for hardly anything if you know where to look. I don't buy mine at the pet store because they tend to be more expensive but I find toys that look like mice at
walmart. they also love balls. You can also improvise. Some cats like to bat around the toilet paper thing that you end up throwing out. Sometimes you can fold up cardboard for them to bat around. You will need some kind of scratch post for their nails. You can buy the kind that hang up on the door or they have some that you can place on the floor and you replace when it is worn out. the best thing you can do is just go to walmart or a pet store and look around the pet area and see what the prices are. the one thing about getting a kitten who will be by itself and staying indoors is that you will have to interact with it because it will get bored and possibly start causing trouble (like scratching at furniture). But as long as you play with it every day, it should be alright. For vet bills, you will need to get the cat a rabies shot every year (sometimes the vet will give you a three year if the cat is indoors) and a distemper shot every year. If the cat is also indoors, you will not need to give it a flea or tick medication (frontline). You really only need that if the cat goes outside. Good luck.