There are tons of sites online and lots of books to read about the care of rats. You could even do a search in here and find all sorts of useful information. I know rats are very social, so, having more than one is a good idea (I only have one now, but, only because her girlie pal passed away). It's a good idea to keep males and females separate, unless at least one of them is fixed. They make rat food that you can buy, but, you should supplement them with fresh fruits and veggies and even stuff like pasta and scrambled eggs. I actually feed my rat parrot food as her main food. They can eat all sorts of fun stuff! They like to climb, so, it's good to have a cage with levels, the more the better. Don't get a ball for them to run around outside the cage, but, do get an appropriate wheel for them to exercise in the cage. Cubby holes and hiding places are good too, like hammocks and igloos and things like that. They need stuff to chew on, and, lots of interaction with you and other rats. I know this is a very general answer, but, you will get tons of advice! Or at least links to tons of advice!