Replicate bar motions with the dumbbells, overhead dumbbell press is like military press, flat dumbbell press like the bench press. Keep in mind that you can use a heavier weight with bars than dumbells, you may bench 200 once, but i gurantee you cant do the same with two 100 pounders. Bars are useful with developing strength and mass, dumbbells give more flexibility and fuller ranges of motion, but also produce mass, just not to the same degree a bar could.
Biceps: alternating dumbell curl, hammer curl, concentration curl, incline curl.
Triceps: overhead press, kickbacks, lying press
Chest: Flat dumbbell press, flys (love these), hammer press (This is a great inner chest devloper hold two dumbbells in a hammer grip flat on a bench. Keep them at your sides and push up and slightly in and then back to starting position with the weights by your ribs.)
Deltoids: Dumbbell press, laterals, bent over laterals, front raises,
Back: Dumbbell rows
As hsfootball said, legs are important to train, they are larger muscles and release more hormone than upperbody exercises. Try doing dumbbell lunges and squats for legs. Another great way to get stronger is by using your own bodyweight. Push ups, dips, pull ups, and bench dips are great for getting stronger.
These are all the exercises i could name off the top of my head, good luck with your program and keep visiting the forum for advice.