I am getting pictures but in the mean time would an old schwin steel frame be good too?

Why are you attempting to make this complicated? All you have to do is find a frame that fits you... Ok so you have a frame now use that one.

I seriously doubt that you have read the posted links to sheldons site as they should have answered your question.Anyway...let's say your Schwinn is the right size,look at the dropouts(thats where the rearweel is attached)then compare them to the Pics on sheldons site(horizontal).Then look at the crank..is it cottered(a "bolt " goes thru the crankarm at the spindle,is it a single piece crank(the crankarm goes thru the BB shell in one piece).If it is ..keep looking for another frame.As the tubing goes ...a higher end tubing set is nice ,but for your first build a Hi Ten steel frame should be good enough to start with.Just don't pay too much for it(i've gotten some for $20 or less).

the only thing i am worried about sit he crank. so no cottered and no single peice and is should be ok

they are fine. If you want something better get a set of bulletproof cranks for cheap.