Where on the coast do you live? LR
that we use for the most part comes out of the ocean. I would be very careful about taking rock out of the ocean and putting it into a tank. There are a lot of critters in the ocean that you don't want in your tank.
As for what all you need for your tank go hear and read these articles...they will help you out. http://www.aquariumadvice.com/articl...php?fldAuto=2/
The equipment that you need depends on what you plan to have in your tank. Basically you need 1.5 to 2lbs per gallon of LR
, a 3" or so sand bed, a good skimmer, lighting to match the animals you want to keep and good water flow.