Congrats! You'll love having a rat for a pet. A good forum to get info from is www.goosemoose.com. It is a pet only forum, so please don't mention feeders if you go there. Frankykeno is correct, rats are very social animals and absoulutely need a companion.

If she has her eyes open and all her fur, she'll probably be able to eat solid food but I like to give babies something easy to eat like lab blocks softened with soy milk, baby food, oatmeal or even some vanilla Ensure. Usually by 4-5 weeks they can eat the same food as an adult rat.

Good luck with her!