Best way to build credit again?

[zolake]

I have been discharged for 2 months now and keep getting cc offers in the mail. I took one 3 weeks ago (a whopping $500 limit) for emergencies only, and don't plan on using it unless I need to. Maybe I should for gas or something everynow and then, but don't even wan't to start the cycle. People have told me I should use it for something small every month and pay it off to build my credit. Now they come everyday. Is there a better way to rebuild? Thanks for any advice. P.S, I'm doing fine living with just my income.....so far.