building my recording room. help?

[redemption91]

Hey guys! Excited about treating my room(s). I put up my terrible sketch of what i have to work with. If you need some more elaborate descriptions of what i have drawn or what equipment i am or will be working with, just let me know. The room is in a basement and the floor has carpet WITHOUT padding underneath it. The wall that the monitors are closest too is connected to the outside of the house and likewise, the other side is connected to the rest of the finished basement.
I have an idea of what I would like to do but am deciding to not let you guys know as I want strictly feedback from those who have done it before and i will compare the feedback with my own thoughts and come up with something that will work!
Im not looking to put a ton of money into this.
I want to work with rigid fiberglass as much as possible.