Nothing is simple.
You are going to need Square tube at the minimum at your level, also Some bicycle parts for the head tube, the bars and possibly the forks. Thats a start.(depending on you design).
I see what you were thinking with the ramp, but unless your set on it, get some new metal.
I would strongly suggest(I believe it was also mentioned) that you do some research on what exactly you are tying to build and look into that, then flesh out the particulars of the vehicles design.
See how they are constructed, what is the construction. Look at parts materials and all the little bits that your going to need.