Larger tanks are usually easier to take care of in some respects because they are more stable. Small tanks need more frequent water changes but they are small and easy, larger tanks can usually go a little longer between water changes but they are larger and can be more work.
Is the tank drilled? Here is what i would recomment to set it up.
-sump (30-40 gallon if you can fit it)- i make them my self out of an old tank. I would also consider a fuge for running some macro.
-Protien skimmer - i like ASM but there are plenty of others
-return pump - had good luck with danner mag drive pumps
-two little fishes media canister and small pump for running activated carbon or other medias
-a few power heads for good water movement in the tank
-2 bulb T5 fixture for your lights.
-about 100-120lbs live rock. If you want open water swimmers like tanks the prefer to have more room
-enough sand to cover the bottom with about 1-2inches. See reefcenteral for a sand bed calculator
-2x heaters - i like jager heaters. I use two because heaters are quarky and seem go bad sometimes so it's good to have two in there in case you lose one.
I wouldn't use tap water. It can have all kinds of things in there that can cause you problems and algae outbreaks. I highly suggest getting an ro
unit for that sized tank.
I would plan on only keeping two tangs in that sized tank. They need a lot of room and if they feel cramped with will stess and can also get more aggressive.
I would also pick up a new 55 gallon trash can and the wheel dolly that goes on the bottom at your local hardware store. I use this to filter/mix my water in so when i need to do water changes i wheel the whole thing out to the tank with an extra pump and some flex hose. This keeps you from hauling buckets of water all over the place.