Lots of info would be required to properly answer your questions....I'd urge you to look for a few hobby related books:
"Natural Reef Aquariums" by John H. Tullock
"The Conscientious Marine Aquarist" by Robert M. Fenner
...both ae great resources for anybody wanting to establish a marine system. You could also try google searchs for specific questions...for example "cycling a marine system" should provide plenty of sources of info. There is also a on-line article titled "Reefkeeping 101" that you may find useful.