Refractometers are better and way more accurate than hydrometers IMO, but they can cost a pretty penny(compared to hydrometers).
1. Clean tank (duh)
2. Add rock to tank (after curing)
3. Pour sand in around the rock, you want the rock to rest on the bottom so any burrowers don't cause a collapse.
4. fill tank with preferably RO/DI water. a good rule of thumb for salt is 1 cup per 2 gallons, but ALWAYS check the salinity before adding it, i like to keep mine a bit lower than SG (specific gravity-
the ratio of the density of a given solid or liquid substance to the density of water at a specific temperature and pressure) 1.025, anything higher is probably to much.
5. get your filter, heater etc. running.
6. let it sit, check the Ammonia, Nitrite, and Nitrate levels daily, once they all zero out preform a 25-50% water change,be aware this may take weeks to months depending on the amount of Live rock you have, and size of the tank.
7. slowly add fish, starting with the hardier of species and waiting awhile for the more advanced and complicated species.
As lights go, Metal Halides and T5 HO fluorescents are the best for the more advanced corals, you can settle for a compact fluorescent if you don't plan on keeping that many corals. But you should probably wait for someone with more experience with lights to help you with the more advanced aspects of reef lighting.
Hope this helps. Any veterans please correct me if i left anything out, misinformed or any of the such.
Happy fishkeeping!