Ideas for New Shop
As for size think about what you need then add 10' to both sides.
I will be building a shop in the spring and will be limited to a 20'x24' shop due to space. Think about the roof line so you can build storage above. Also as said before as much light as possible.
As for heat I would at least put a small gas system in, Most building is done in the winter and you would want at least 60degrees to keep the glues cureing properly.
For building surfaces, I use a 4X8 table on wheels so I can move it around. I like a table I can walk around as I work so I don't have to move the plane alot. Also I have a sawhorse with a padded holder on it so I can put planes on that to work also.
V-Snap