I wanted to add that the key to success is consistency. Over time you learn what works for you and what doesn't. I hate the idea of always following someone else's training routine. At times this is okay if eventually it leads to you adopting what works and rejecting what doesn't. I workout about 3 days per week for about 50 minutes and get as much out of it as when I was younger lifting 5 days a week for an hour or so. One thing that took me a few years to learn to appreciate was supersets and occasionally trisets. Almost everything I do is part of a superset. I can't imagine not using them. But of course when I was younger I was more likely to just follow another person's routine because I didn't know any better. Years later, I've done and read a lot, therefore I know more, ergo my personal training is more efficient because I know my body more.
Here's some quick general advice. Train like a bodybuilder, not like a powerlifter or weight lifter (if you're going for looks more than anything). Use high intensity techniques such as supersets and drop sets. Don't neglect isolation training. It shouldn't comprise the bulk of your routine, but some people totally neglect isolation work for some odd reason. Probably because they're idiots (gym "bros"). Don't overdo arms. If you're working your chest, back and shoulders correctly, a small amount of arm isolation work is all you need. Some people do overload for arms and it's pretty much a waste of time and energy.