Start with a program developed by one of the many fine authors on this site. I personally recommend Chad Waterbury. He lines out a nice progression of his programs for you to work through. No guess work, no developing your own shit, or some Personal Trainer's "idea" on getting bigger and stronger. If you read enough stuff here and get some experience to see what works the best for you then you can dabble in developing your own but for now I would leave that in CW's, CT's, DJ's, CS', ect hands.
Dont forget about nutrition; see Berardi for that.
Tons of great stuff here just click on the authors button to the left and start reading. Knowledge is power. And the best part is ALL OF THIS IS FREE!
When you are ready for supplements I recommend that you buy from here. I love the supplements and if I dont feel like they work for me I get my money back...not too shabby.
I am a fan.