Gra, haven't read the other posts, but I've been training for over 10 years at varying levels of intensity. I have never trained more than 4 x 60mins for more than a couple of weeks in a row, and most of the time 3x 60mins is the time spent in the gym. With bodybuilding it becomes a lifestyle and it takes more commitment and concentration outside of the gym than in. You need to make sure you are getting enough of the right food at the right time and enough rest. This is when you grow!, not when you are in the gym.
After a while it will become second nature, and as I advised Lewis, make small changes at first otherwise it will be too much of a shock and you could give up.
Don't waste money on any drugs at first either. Yes they work, but my advice is to get to know your body first and build up a solid foundation naturally. I am 5'7" and got to 15.5 stone naturally before I went on the gear. I then went upto 18st and had 20" arms

. I then had testicular cancer(read into this what you will regarding drug use!), I dropped back to 15.5 stone and then levelled out back to 17st. Since then I've trimmed down further to 16st and haven't touched the gear for 6 years. This show's that building a solid natural base is the way forward
It can get a little extreme if you are not careful. I used to get up in the middle of the night for protein drinks etc and have heard pros tell stories of picking desicated liver tablets out of their own puke and re-eating them again, coz they've thrown up on a leg sessions

You do not need to go to these extremes!! After all it should be enjoyable

and you should take pleasure in being able to ttrain and eat consistently resulting in you changing the way you look.
Hope this helps
Paul.