I agree that you should do what you want to do. Here was my biggest mistake, i went out and bought everything and didn't really have a game plan. You should in my opinion look through this site and get a feel for what people are doing, common problems, and what they have as far as equipment and live stock to get an idea what you're getting into as far as, set up, maintenance and ultimately money wise.
Do you want something small, do you wanna go big, community tanks, specific species, planted, fish only with live rock (FOWLR), reefs, corals...Obviously you probably know the list is endless. But if I had to do it all over again, I would start simple (depending on your experience level of course). Doing too much too soon can be frustrating.
But defiantly have a game solid gameplan, and don't rush it, great tanks are built over time, not in one shot. I've developed a great knowledge from reading random posts and asking questions. And i just joined in April.
Good luck and also, WELCOME TO AA!!!!