Make sure you do this really slowly. Saltwater tanks are very expensive - you need a protein skimmer, hydrometer, loads of testing equipment, powerheads etc. Read up on everything and anything you can think of and listen to the advice you're given. Just remember, marine tanks are not for a beginner.
Perfect advice!
Start looking at all the threads on the marine section now and maybe start a proper diary in the marine journal section. Then any questions you get you can post there, but don't forget the best way to find things out is buy lots of books and read up. I read up for over a year before I took the plunge into marine tanks and I had been fishkeeping for a fair few years before that.
Don't think your clownfish when you get them will automatically play in any corals. I've had mine for some time and they show no interest in the corals whatsoever. Most corals, even softies, need a certain amount of the right lighting to thrive. Some rely on light to gain their food and must have a particular minimum level of lighting.
What lighting does your tank have?
Anemones are an expert marine fishkeepers challenge and not for beginners at all. Most of them need very specific lighting and very stable tank conditions that do not fluctuate, hence most of them being only suitable for very big tanks and also very mature tanks and be kept by people who know exactly how to look after them.