When I first started lifting I started out with similar setup, a couple of dumbells and a ez curl bar.
My chest workout consisted of bench/db presses on the ground but like what was said above, the range of motion was really limited. Changed to using the ez currl bar with weights as a push up bench. For incline I would just throw my feet up on the wall... I got to the point where I could do handstand pushups.
For flyes, I would get the dumbells and start with them close in and in a push up position. I would slowly roll them out until I was in a flye position, than roll the dumbells back in. I remember using a carpet flooring made it easier to control.