I use Arm and Hammer super scoop, you can use anything you and your cats like. I tried about three litters, Fresh Step (too much perfume for me), cat's Pride (didn't control odor well enough) and now the Super Scoop which I like.
Get scoopable litter, if you don't the urine builds up in the box and SMELLS.
I change the whole box about once a month so that's when I get a new box of litter. Scoop the clumps out every day so that is doesn't start to stink, if you let it get too messy many cats will go elsewhere.
As Romy said wet food is much, much better than dry food. I don't consider dry food cat food, it's completely inappropriate for a cat and leads to urinary disorders, obesity, diabetes, Irritable Bowel Disorder and allergies due to all the unnatural ingredients. NO dry food is safe, dry food requires carbohydrates to be made, whether it be grains or potato or tapioca, is needs carbs or it would not turn into kibble. Cats cannot handle this carbohydrate at all, they are carnivores. a mouse is 2-3% carbohydrate, dry foods are usually between 25-50% carbohydrates. The cat's pancreas, in an attempt to handle all this carbohydrate (which becomes sugar) is always working at stabilizing the blood sugar with insulin. Eventually the pancreas just gets overused and starts to fail. Then kitty has diabetes. It has been found that diabetes can be "cured" by feeding all wet or raw food(I say cured because all you have to do is feed the cat normal cat food, no insulin or anything, but if you ever feed dry again the cat will be diabetic again).
Cats have a low thirst drive because they are descended from desert animals. Cats on dry food alone will not drink enough water to be fully hydrated, they will be in a state of chronic, mild dehydration for their lives, it's not enough dehydration to be noticeable but it is enough to wreak havoc on the body. Their urine becomes more concentrated causing UTIs, crystals, FLUTD and blockages.
Cats bodies do not tell them that they are full until they have eaten the right amount of protein and fat. It does not matter how much carbs they eat, the body will not say they are full until enough protein is eaten. unfortunately most dry foods have lots of carbs and less protein so the cats have to eat and eat and eat in order to obtain enough protein and at that point they have eaten WAY too many carbs. This makes a fat cat. Then the vet will say "feed this diet food" which is basically a food that takes away fat but not carbs (in fact they often increase carbs and decrease protein by filling the food with more useless calories) so the cat continues to gain weight . The vet will tell you to restrict food but because the cat is not getting enough protein in his small meals he is STARVING and will cry and cry for food because he is not getting what he needs and he knows it. The two most common complaints from people feeding diet foods is it doesn't work, the cat is always hungry and the cat won't eat it (yum peanut hulls).
So that's just some of the problems associated with dry food, i could keep going but I'll give some links instead.
I would feed at least 75% wet (or raw or a mix of the two) and no more than 25% dry (less is better). canned is expensive but if you make your own raw it's much cheaper. I do that for one of my cats (I'm trying to transition Neko, it's a pain for picky adults, kittens are super easy). both are good options, canned is a bit easier but raw is cheaper and unlike any commercial cat food raw actually cleans teeth. raw should not be fed ground, it should be fed in the form of whole meats or even whole animals (you can buy frozen mice, rats, guinea pigs and chicks). no veggies, grains or fruits are added to raw. that is why I don't recommend pre-made raw and I prefer making my own.
If you are interested in learning how to feed raw send me a PM and I'll help you. It's not hard.
There are tons of good wet foods though, look for foods without grains or at the very least without a lot. Corn, Wheat and Soy are off limits. It's like with dogs except grains, fruits and veggies are even worse for cats.
My favorites are EVO and Wellness (CORE and the other ones). I also feed Nature's Variety, California Natural, Innova, By Nature, Felidae and other good ones are Ziwipeak, Merrick, Blue Wilderness and Evangers. There are more I'm sure I'm missing, some foods with "okay" dry foods (say they are grain heavy or something, like wellness) will still have really good wet foods. I would rotate between several wet foods so kitty does not get bored and try not to feed too much fish, it has possible negative health repercussions.
Here are some links on diet (if you go and explore the sites I want to keep in mind that I don't agree with their method of feeding raw by grinding and supplementing):
Diet and Disease
Feeding Your Cat  Know the Basi
For information on raw feeding:
Raw Fed Cats
Sorry to bombard you with all of this, cat nutrition is a passion of mine, especially raw feeding. Good luck with your new cat or kitten, are you looking on petfinder? Do you have any in mind on there?
