I recommend finding an instructor/trainer. They'll keep you motivated, make sure you do the exercises with the proper form, know how to pace you, know when to change up a program, etc.
I agree Erik, good advice.
I wanted to ask you what you think of the Titleist Performance Institute and their certification?http://www.mytpi.com/
I think, like other instructors and everyone, there are good ones and bad ones. I've never particularly cared for the "assessments" that seek to say "oh, you early extend because you have low ankle flexibility" and stuff like that, but they've moved away from teaching "golf swing stuff" and have focused more on just assessing someone's strength, speed, and flexibility, and working on that knowing what's required for a golfer.
So it's much better than it was originally, but you've still gotta find a good one.
My guy is TPI, but… we almost never really talk about it. Lower weights, more repetitions, lots of stuff at speed. That's my understanding of the better type of program for golfers. I still lift weights, but we do a lot of TRX stuff, and a lot of stuff with bands. We switch out two or three of the nine or ten exercises (3x each) each week or so.