Don't start off with tangs, can cause a ich outbreak. Start with something nice and simple a pair of clown or two. Then maybe a school of chromis, and some easier fish. For introducing the fish I would QT all fish, and if you can't a acclimation box if you can't get that Dr foster has some nice acclamation tubes that you can just drip acclimate. Also make sure you have a protien skimmer proper lighting if you are doing corals, a heat, power heads, and RODI water.