How old will they be when you bring them home? 'Weaned' means different things to different people. Ideally kittens should stay with their mother and siblings until 12 weeks, but 8-10 weeks will work. Many 'breeders' ("We had two cats and they made babies" people - not actual responsible breeders) get the kittens gone at 6 weeks...which does not set you up for success. It's a heck of a lot more work.
Keeping them confined for the first few days, depending on their comfort level is best. Have a kitten room set up, and plan for them to be in it whenever you're asleep or out for the first few months. Kittens are naughty and will get into all sorts of trouble - it's safer for them to be confined to one kitten-proofed room when you can't supervise to begin with. Your TV room will be fine, as long as you kitten-proof it!!!
Three is the correct number of boxes for 2 cats. That being said, in you live in a multi-story home I would suggest at least one box per floor until the kittens hit about 6 months. Having a box close at paw will encourage good habits for their whole life. If you have a smaller, or single floor home, then just space the boxes out as you were planning to.
As far as litter goes, I don't recommend clumping clay litter with kittens. Occasionally they'll eat it (or they'll play in the water, then go potty and become 'breaded kittens' then lick it off...) and the clay will clump in their little bellies, possibly causing a blockage. Because of this I prefer the corn or wheat based litters. World's Best and Swheat Scoop are both clumping litters, but safe for little ones. (I like them better than clay anyways, but that's just IMO)
Canned food is best, yes (well, raw is better, but not everyone is up for that). Many of the others here can suggest good brands (I feed raw, so I'll keep my nose out of it
) but for feeding schedules kittens should be fed 3-4 times/day until about 6 months. After that switch to twice a day. Some adult cats do best on three meals a day too, depends on your kitties.
Having quite a few scratchers is a great idea - get a variety! I've got: two cat trees in the living room with a mix of carpet and sisal textures and a variety of directions to scratch in, a boot mat they're allowed to claw (on the floor, rippled short carpet texture), a sisal post in the basement, another little cat tree in Torri's room, and 2 cardboard scratchers that migrate around the livingroom. Different kitties like a variety of textures, so try a few different things. The more you give them the less likely they are to go for the furniture.
As for the rest of it - I always read out loud to new pets, especially while you're feeding them. That way they're getting used to your voice, associating it with yummy food, and your eyes are focused away from them which will help if they're anxious.
Other than that the best thing I would do is start handling them right away. Once a day pick up a kitten, give it some lovin', and feel it's whole body so it gets used to those sensations. You may need to give the kitten a toy to chomp one while you do this, but make a point of checking their eyes, ears, nose, mouth, and paws in particular. This will help with nail trimming, vet visits, and necessary grooming. If one is long haired start brushing right away! Kittens don't typically get too knotted, but that's exactly when you want to practice with the brush - when it won't hurt!
Last thing - never put down a fussy kitten! Whenever you're holding them, for whatever reason, wait until they settle down and calm a bit before you set them down. It doesn't have to be long, just a second or two of calm, but if you set them down when they fuss they'll learn to struggle and that will make your life way harder than it needs to be.