The easiest way to remember what the strings are lettered is to use a mnemonic (device to remember something). A good one is: "Eat A Damn Good Big Elephant." (i.e., the first letters in the sentence correspond to the guitar strings).
Looking down on the top of your guitar, the fat string on the top is E. The subsequent one is A, followed by D, G, B, (high) e.
Personally I like a backwards one: "Easter Bunnies Get Drunk At Easter."
There's a site that a guy put together at: http://www.people.fas.harvard.edu/~desmith/guitar/
and he explains EVERYTHING (almost) that you'd need to know about playing guitar. He's into acoustic, but a lot of his info carries over to electric. I HIGHLY recommend you check it out. I was playing the same songs I learned from someone in high school for like 20 years, but got serious about playing a couple of years ago. I now play both acoustic and electric and it is the passion of my life. I got a lot out of his site. It's been a while since he updated it, but the info is still valid. One thing you should know, tho: he's taken down the song tabs he had because of legal trouble. If you want to check out tabs, go to OLGA.
Keep on rockin,
Metalhed