If you're going to use live rock and plan on curing it in the tank, you may want to start skimming right away.
Some other things you may want to consider before you get fish are a 10g Walmart tank and fairly cheap power filter to use for a quarantine tank for new fish. Along those lines, having some basic medications on hand are always a good idea, since many times you don't have a lot of time to treat a sick fish by the time it starts showing symptoms. Your basics are going to be: antibiotics (gram negative and gram positive - Maracin is a good brand), copper medication, and formalin.
