I don't know to much about building a workshop in the garage but I did do this in a room I built in my basement- the table is made from the ply that is used under laminated counter tops 4'x8' 1" thick. I had the homedepot do most of the major cuts and I did the trim. I sealed and varnished and waxed the wood to protect it from glue. For support I purchases heavy duty shelf brackets and the metal black shelves from Lowes. (see pic).

To store planes I use the cheap shelf brackets with the sliplock supports covered with thick self adhesive pope insulation. Allot has been done since these picture were taken (more shelves) lots of hangars for tools and electric goodies.

Hope this gives you an idea or two..