I currently only have 2 cards. One is my checking account debit card, and a AMEX Gold card through my company, which I really don't think affects me at all.
I never had a major credit card and have excellent credit. I fear that I will really mess myself up with one. My mom co signed on my first vehicle loan few years ago, and that's what i used to build from.
I did have a compusa card i used once before they went under. Currently have a best buy card that i used once and shredded. unfortunetly that doesnt stop me cause you can use your SS number and drivers license to buy stuff at the store.
don't take advice from me though, I'm horrible with money ....