Yeah I can help out but I need some more info. So you have the floor down? if so, it just a matter of framing up the walls and the roof. For the walls, start with a top and bottom board, the length of the wall (2 boards if needed). Place 1 96" stud on each end so you end up with a square frame. After that, place stud in the middle every 16" on center; all out of 2x4. You should build this laying flat on the ground and then once completed, raise it up, attach it to the floor and use some 2x4 braces to hold it up until you get the other walls done; obviously making sure it is level. Do the same for your other walls. Once they are up, take another board and put it along the top, making sure to connect each wall with the other. From there, your ready to frame the roof and put plywood on the roof and walls. Let me know when your there and we'll talk more about that.
Later cuz,
Scott