dont read the magazines. they're full of crap and those workouts are not for human beings. they're for animals with tons of muscle from years of training who recover faster than regular people because of the drugs. if you have hardly no muscle at all try Vince Gironda's beginner workout.
http://www.teenbodybuilding.com/callum14.htmif you've worked out before and are pretty strong but just don't know what to do as far as a serious routine you can try each muscle one day a week thing. which is what most people do.
There's lots of info on the internet but be carefull about overtraining. diet of course is important. if you wanna get big eat 1.5g of protein per bodypound or more. optimum nutrition gold standard is the best quality for value protein. don't buy weight gainers you can make your own with protein powder and just add a bunch of stuff. i do chocolate flavor protein, peanut butter, milk and fiber powder. when you eat a lot you better have your fiber or you'll have problems.
the other day in the gym there was this juice up trainer training a 15-16 year old kid and this man at the same time. he was making them both do what must have been like 30 sets of bicep curls. the man looked like a regular guy, had okay arms but the kid was like 115 pounds. never get into that crazy over training/ arnold schwarzenegger each muscle 3 times a week, working out twice a day... i dont believe arnold actually did that stuff but if he did... he's not a human being.