Jay, lots of good info here but I will add one comment.
When I wired my shop I put a drop every 6 foot. At the time I figured one receptacle would be enough in each box as I have a drop every 6 foot......wrong. Especially when I'm doing wood work and need more that 2 places to plug in a cord.
Luckily I used the big box so I went back later and added another receptacle to each box so I have 4 places to plug a cord into.
220--I have two but wish I had put a 220 receptacle at each garage door!
