what im planning to do and correct me if im not doing it right :]

hello this is my first post ive been hanging in the chat room and those guys have been great. but on to buisness. im planin gon a 45 gallon sw reef tank with a 15 gallon sump. i know im getting live rock i havnt figured out how much yet. im getting 2 powerheads for water movement, and a overflow to get water into my sump other than that ill keep posting on this thanks for all ideas and help
Anthony