They are so intelligent that they can learn to do tricks and will even come when called. They will require daily fruits and vegetables to keep healthy. Rats love the company of other rats so it is recommended that you get at least two. There won't be fighting if you introduce them at a young age. Male rats can be neutered to avoid their marking territories.
Rats like to use a litter pan and seem to enjoy the ground walnut shell type litter.
Rats should be kept away from other small animals as they are omnivores. You need to be prepared to give your rat some live food such as crickets. Alot of toys that are designed for birds work very well for rats. If you are still interested in getting a rat, please visit your local library and read up on this wonderful species. Both of you will be much happier because you did.