+1 to the above. Locate a club close to you and just join in on the fun.
http://www.uspsa.org/locate-uspsa-clubs.phpThe local shooters will most likely be your best bet for information on how to get started, what gear works best, where to get it, and maybe even how best to train. For the most part I am self-taught but I have taken a couple of classes from one of the National Champions which was well worth the time and expense.
There are online forums such as Brian Enos that can help point you in the right direction, answer questions etc... but just getting out and shooting a match or three is the first big step in the right direction. I went from a casual plinker to a shoot-a-match-every-weekend plus nightly dry fire sessions, and have been loving every minute of it.