Kenaba, I don't have any plans to offer you but I do have one suggestion. In my opinion I would try to go atleast 20' x 20', and like aniceone2hold said go higher than 8', I like 12' myself. I have a 24' x 12' shop that I just stick built from scratch, 2x4 walls on 16" centers, I built the roof trusses myself, metal roofing and crappy old grey Masonite siding. I found that a 12' wide building gets pretty cramped 90% of the time, thats why I said go at least 20' x 20'. This of course depends on how much room you have available.
Oh ya, Welcome to the forum!