Need a good workout routine...?

I'm trying to drop a couple pounds, when I go to the gym I do lk a 45 min cardio then lift a lil and do ab & leg work outs too. So I'm usually at the gym for and hour and a half to two hours. I'm trying to eat healthier as well, but should I just focus on cardio? I want to see results, but not sure if I'm approaching the work outs right I guess you could say...