I'm a beginner (at absolute best) when it comes to comics. I usually read whatever my friends throw at me, and that's about it. But if I'm looking for new suggestions, I always head over to Carol & John's.
They have EVERYTHING. A larger selection than most comic book stores I've been to. Its easy to get overwhelmed with all the awesome comics. Fear not, though. Carol and John are the nicest people, and will bend over backwards to help you.
If I ever need a gift for my dude (and some of my lady) friends, I head to Carol and John's. I always know they'll steer me in the right direction.