I'll throw out a few ideas but there are a number of "get me started" threads on this board that will help you get up and running. Just do a search and you will find tons of info.
Live rock - Don't skimp. Buy the best, well cured rock you can find/afford. General rule is 1 lb per gallon but don't cram your tank full of rock. I have 30 lbs in my 45 gallon and I am taking a little out this weekend. You can save a little $ by buying some dry rock which will be seeded by the LR you get.
Sand - I would advise against Home Depot play sand. It will vary from region to region but there is a better that average chance that sand will contain a high level of phosphates, silicates and other things which will fuel algae growth and diatom blooms. Buy aragonite based sands that you can get from almost any petstore. It does not have to be live. If you go with dry sand see if you can find someone or a LFS to ive you a cup or two of their established sand to seed yours. If not your LR will seed it.
Skimmer not necessary. WC's will take care of pollution through dilution but ONLY if you stick to them on a regular (recommend weekly) basis. Skimmer will help stabalize your tank though.
Flow - You want it! get powerheads if you don't have them. Wide flow patterns are best.
Agree with the go slow. Get a hydrometer or refractometer to check specific gravity and some good test kits for ammonia, nitrite and nitrates. Once you get corals, get kist for calcium and alkalinity as well.
Can you give some specs on your lighting, flow rate from your pump, etc.