Lots of good advice above, so my only addition to this will be to take things slowly. Always look for opportunities to learn in the threads here and if you find a Local Fish Store (LFS) that you can trust or your local reef club, that will be a great source as well.
The Conscientious Marine Aquarist is a book that you should consider owning. I hope others will suggest a couple more. I do hope you come to enjoy this hobby, and I believe that as you gain knowledge and see success (and a few failures) as you do it yourself, you will come to that point.
Good luck.