Big one is to make sure your flooring is stable. This typically means a concrete floor. You'll notice people walking across a floor "jiggles" your work under a scope. Consider the dust you'll encounter in the garage also. I'd also second Carlos' inputs on the compressor and metal chips.
We all know our spouse gets the largest vote in where many of us end up setting up shop, but having a GOOD baseball team (not the Yankees) on the TV helps.
Thanks everyone.... Looks like I will be in the garage. I live at 7600 feet so it gets very cold in the winter. Do most of you wear something to keep metal chips off your cloths?
I wear a shop apron. When I'm done cutting, I get hold of the bottom and shake out the apron over a trash can. Keeps metal chips out of your clothes and off the floor.