You have to decide what corals you want to keep. If you want mushrooms, softies, lps, then what Luke described above has worked for him and it is proven to work.
I personally like skimmers, think they have a place right at the top of the importance ladder, and would not have a tank without one. I also think that MH is a key to having a thriving SPS tank. I will conceed that you can keep SPS alive under T5, I just don't think they thrive. Different folks...different strokes.
I would recommend visiting tanks in your area, looking at tanks on here, and other sights, and finding ones that look nice to you. Find out the things they are doing and then you have an idea of what you need to do.
There are tanks that look like garbage to me that others think are great. There are tanks that look great to me but look like garbage to others. It's just like art...in fact I consider the tank art.
Do your research on anything you are told (stuff from me too...lol) to make sure it is substantiated with real world experience...not theory.