Then the biggest things to look are right now are the skimmer,lights,and weather or not to run a refugium.Dont skimp on the skimmer and lights.Those 2 are the life of a reef tank.Also look at live rock,you'll need 1 to 2lbs of rock per gallon.It dont have to be all live rock.Base rock is cheaper and with time the live rock seed the base.
And above ALL,research,research,then research some more.Then when you think you got it down pat,research it again and take your time.The only things that happen fast in this hobby is the bad stuff.