Welcome. Now, read, read, read!
There's a ton of info here if you know how to find it. One way is to simply use the "search" function. The other way is to use the knowledgebase, you can browse categories or search that, there are links to nearly 1500 reef articles by subject.
Here's a link to the "reefkeeping 101" section:
http://www.reefsanctuary.com/knowled...links.php?c=46
...and, of course, there are plenty of people here happy to answer any questions you have!
Travis