Had one of these in California. Be sure to plan plenty of electrical outlets. Also consider (in advance) whether you're gonna want heat and air. AND ventilation! Foam insulation will lower the power bills for those items, and make for a neater installation, too.
Where will the compressor go?. Does it need 220V? Plan at least two air "drops"; one for inside (sanding table, sanders, other air tools; one for outside (spraygun). Remember water traps and drains for each drop. Put an oiler in the inside drop line; air tools need constant lube.
You cannot have too much lighting! Everywhere! Plan it in zones, so you don't waste power lighting areas you're not using. Put down a light-colored linoleum flooring, so you can find the "Oopsies".
Plan two workbenches; one should be on casters.
Bound to be other stuff I've forgotten.
Oh, yeah. ENJOY!!!