I hand-picked most of my live rock at Inland Reef in Nashua (now closed). Never could measure ammonia, N03 or N04 from day one. I still waited 2 weeks to add snails, crabs, etc. I added my first few fish a week later (in early 2000)....Yellow Tang, Dottyback. The Yellow Tang is still in the tank. The Dottyback died a few weeks ago, I believe from natural causes....had him since early 2000, over 5.5 years.
The first corals were soft corals and the two anemones. The soft corals were sold a while back. The two anemones are still thriving: a Haddoni and a Magnifica.
SPS corals were added at around the 3 month mark and most did really well until the infamous worm attack of 2005.
To add stuff early you need to use cured live rock...not trans-shipped, but from a LFS that has cured the rock in their sumps. Otherwise, I would not go so fast with adding things.