132 lbs starting to gain belly fat?

I've been noticing over the past year that my belly is starting to protrude over my drawers just slightly. I'm 132 pounds, 6'0, and I'm 21. I tried working out 2 years ago, to minimal affect.. my family and relatives are all thin. I don't drink soda's, and eat out seldom. I've read spot training doesn't work, so what can I do to tighten up my stomach, and maybe even gain some muscle?