Lift heavy help please?

They are certainly heavy enough to get you started. Eventually you may decide you need heavier weights or would like to join a gym. For now you can do wall sits (without weight progressing to holding weights), bodyweight squats or goblet squats with a weight, single-leg stiff leg deadlift, bench press, pushups, one armed rows, overhead press, front raise, lateral raise, lunges. Though I am now lifting heavier weights and need barbells/racks, when I first started I don't think I did anything with dumbbells heavier than what you have. My front/lateral raises still aren't heavier than that

If you can purchase a stability ball, you can use that as a bench for a lot of exercises too (chest press, dumbbell fly, skull crushers, core work)

exrx.net has videos and explanations for all these exercises.

Here's an example of a beginning bodyweight workout:
http://www.nerdfitness.com/blog/2009/12/09/beginner-body-weight-workout-burn-fat-build-muscle/

These two also look great:
http://www.bodybuilding.com/fun/jamie-eason-livefit-12-week-trainer-at-home-workout-pull-day.html
http://www.bodybuilding.com/fun/jamie-eason-livefit-12-week-trainer-at-home-workout-push-day.html