My wife and I purchased our first garage in May, and moved into the house attached to it. 
It was a finished 3 car but pretty plain without a single shelf or spot of paint other than white
I quickly added the shelf along the back wall for storage
Put up some pegboard
and hung a few signs
That sufficed for a bit, while I could make some improvements to the house
4 Weeks ago I decided to epoxy the floor and start on the paint scheme as well as put down molding to to seal the bottom of the wall and floor.
This is how it sits now with the addition of my signs again
Next plan is get 220 in the garage (I'm going to run it all in well placed external conduit and boxes) as well as plumb permanent air into the garage and move the air compressor out back.
For the air I'm going to use a system similar to the "Rapid Air" kits out on the market but I'm piecing mine together from McMaster Carr as well as making some modifications to their manifold design. This system will be run externally as well, but will also be placed well enough that it doesn't look tacky. I will have a few manifolds placed at various points in the garage with quick connects.
Please feel free to make suggestions and criticisms

It was a finished 3 car but pretty plain without a single shelf or spot of paint other than white
I quickly added the shelf along the back wall for storage
Put up some pegboard
and hung a few signs
That sufficed for a bit, while I could make some improvements to the house
4 Weeks ago I decided to epoxy the floor and start on the paint scheme as well as put down molding to to seal the bottom of the wall and floor.
This is how it sits now with the addition of my signs again
Next plan is get 220 in the garage (I'm going to run it all in well placed external conduit and boxes) as well as plumb permanent air into the garage and move the air compressor out back.
For the air I'm going to use a system similar to the "Rapid Air" kits out on the market but I'm piecing mine together from McMaster Carr as well as making some modifications to their manifold design. This system will be run externally as well, but will also be placed well enough that it doesn't look tacky. I will have a few manifolds placed at various points in the garage with quick connects.
Please feel free to make suggestions and criticisms