Good Morning!
First of all, here is my bodyweight exercise list:
http://forums.d2jsp.org/topic.php?t=21269614&f=60&p=331731288Bodyweight exercises
Secondly, assuming you have ONLY dumbbells, you are extremely limited. If you have a BENCH with the dumbbells, you gain a lot more potential exercises.
As a result, to keep everything cheap, I would advise that you get adjustable dumbbells (5-100 lb) like the bowflex, as well as an adjustable bench. That would be the absolute cheapest solution for you.
You could then do the following exercises
Chest - DB Press, DB incline Press, DB Decline Press, DB Flies, DB Pullovers, Bench/Chair Dips, and Pushups (close and wide grip).
Back - DB Deadlifts, Bent Over DB Rows, DB Wide Rows, Lawnmower Rows, Pullups/Chinups, DB Back Flies
Shoulders - DB Shoulder Press (seated), Arnold Press, Front Raises, Lat Raises, DB, Standing DB Press, Rear Delt Raises, DB Upright Rows, DB Shrugs (side and front)
Legs - DB Squats, DB Lunges, and DB Calf Raises.
Arms - DB Curls (standing/seated), DB Hammer Curls, DB Reverse Curls, Concentration Curls, DB 21's, DB Kickbacks, DB Skullcrushers, Close grip chair/bench dips, Diamond Pushups, and Standing 1 arm DB extensions
You can train at least 4 exercises per muscle group, with at least 4 sets of each, going up in weight each set. The exception is legs, where you will train 5 sets of each of the 3 exercises.
Alright thanks for the answer but at what weights should i start? i have no idea what a good weight is to start