Omega, the live rock is your filter and I doubt you will be vacuming the sand with any success - apart from that you will not need to with the correct clean up crew
If you intend to keep corals then you really will need to use RO water.
A shopping list:
Extra power head or two (for the tank) - I went for the KORALIA as recomended by the guys on here, I got the Koralia 2 but you could buy a couple of K1 or nanos (check out ebay)
Refractometer, don't bother with a hydrometer - again ebay
Bucket of marine salt - don't bother getting packets, it's a false economy
Sand, you will need approx 20 1bs - don't bother with live sand - it will seed from the Live rock
Testing kits for nitrate, nitrite, ammonia and PH - just to start with you will need more a little later - Salifert tests are generally considered the best - prepare yourself for a shock on price!
Water container - food safe, Camping and General do them for a good price (that's if you are in the Uk)
Container to mix your water - empty salt container is ideal I find - see if lfs will give you one or sell for a couple of £s
Cheap power head for mixing water
Cheap heater to heat water when mixing
Syphon
Good quality tank scrubber and algae magnet - you get what you pay for here, don't go cheap! Ebay again
Ro unit from RO man - you can get one for about £65, a sound investment in the long run
Live Rock - you will need about 15/20 k - look to get it from a reefer breaking down a tank - if in the Uk check out the classifeds on ultimatereef.com (there is a lot on there at the moment) or ebay, or aquarists classified - you will get a better deal, less die off if it is local ( I transported mine for an hour in water and had little die off) and better rock with lovely coraline growth and more hitchhikers - a win, win situation
Good book about invertibrates
Good book about fish
Good book about corals (have a read of my thread for 'the book') if you intend keeping corals
My suggestion to you would be go slowly, plan and do your research - ask us loads of questions, we have all been in your situation and done the same You could go out and buy all this stuff from your lfs, BUT it will COST you a little time and planning can save you an awful lot of money and boy, you will need money because this is an adictive, expensive hobby
Seffie x