Not too bad a plan, I would add all the rock at once though. If you add live rock over a few weeks it may throw the cycle out a bit because there will be die off from the rock.
Make sure your clean up crew is small to start, they won't have much to clean without fish!
You got some powerheads right? Get them on the before adding corals/fish. I can't remember what you said your lighting was but check that out before purchasing corals for sure to make sure you have the right light to support them.
I wouldn't get damsels ever, but that's just me!