congratulations human, you have been chosen.
just put out a litter box, some food, water, and a scratch pad with some catnip (or just don't buy fragile/expensive furniture).
I only plan to get mine vaccinated one time, because they're indoor. they say feline HIV can be transmitted through mosquitos, but I'm not too worried. other than that, maybe have some revolution (those squeeze capsules for the back of their neck) handy in case they get fleas, worms, mites (revolution takes care of all of them).
that's about it.
PS don't try to toilet train them.. it screws them up.. I tried for a year, and because I'm gone 10 hrs/day nonstop with 2 cats, I was never there to clean it up often enough. (plus junior is just a total dumbass who can't learn to aim in a hole to save his life) now they're back to the litter, and they don't cover up their shit anymore. instead, they just scratch the plastic on the side like they did with the toilet. I had thought that I could just get them trained, go on vacation, and come back and flush, but it's not really that simple. If you're worried about sanitation, put some sticky mat around the litterbox