A reef tank would contain corals, live rock, live sand, and fish of course but not necessarily. You will need to maintain alkalinity and calcium more carefully with a reef.
Reverse Osmosis water unit will filter your tap water and produce water that is more pure with the heavy metals removed, and can also eliminate nitrates from entering the system, and reduce phosphates or eliminate them as well.
Many try to prevent ick with a UV sterilizer, however it is not the best method. Quarenteening the specimans for a while is the best method, up to and including hypo salinity procedures if you find a problem with the fish. It serves to prevent infecting the main tank with unwanted parisites.
Plan your inverts(cleanup crew) after the cycle as you will most likey need them at that time.
Thomas