What works for you might not work for others and vice versa as far as routines go.
For example, my chest.....I do chest once every 2 weeks, bench, flys and that's it. Lots of people think that ain't shit, but it takes me 2 weeks to recover and i got good growth given my genetics. I got gym friends that do their chest twice a week....if i did that, my pecs would just explode.
Diet, is 90 percent unless you are planning on competition. Then diet is only 85 percent. I don't follow a "strict" meal plan, but i am strict about what i can and can't eat and the times i do eat.
It's pretty simple, lean protein every 3 hours, lots of vegetables, some fruit, healthy fat like coconut oil. (organic if you swing that way) I cut out fruit after 6 p.m.
Stay away from any processed foods and fast foods. Bread is sugar, pasta is sugar, stay away from sugar, soda, fruit juice....the one exception being right after a workout. Liquid carbs are good right after a hard workout, in moderation. Like right after, while you stretch.
Rest is key aswell. Your muscles grow when you rest and recover, not when you lift. So you want to look after your rest and recovery (which diet is a big part of) as much as you do your weights.
Don't let what you do in the gym, mess with your diet. Your diet is key. Super key. You follow a good diet, whatever you lift will turn to muscle and shed fat. Diet, diet, diet!!!!
Don't waste any money on supplements. Unless it's just protein powder or maybe fish oil. Creatine is not needed. Spending any money you'd waste on supps. is better off going towards vegetables.
Other than that, what are your goals?
Weight loss? Muscle gain? To gain max muscle, you might get softer first....to lose max weight, you'll shed some muscle or atleast have a hard time adding any.....if you just want to get healthier, just start eating properly and lifting and you'll figure out what you need to adjust as time goes on.
Learning what your body responds to, is key. Both from a diet perspective and a weight training perspective. I can't sneeze without my triceps growing! but i got skinny little forearms and calves!
Also, cut out booze. Sucks i know. You are young, so you probably can't do that. lol
Limit yourself to 2 or 3 drinks max. Drink hard alcohol mixed with water. (or don't mix it)
Booze raises estrogen, bad, and it also stops your body from burning fat while telling your body to store more fat. It's like the fattiest thing there is pretty much. The less alcohol you drink the better.
2-3 shots of vodka a couple nights a week isn't going to hurt too bad...but anymore and it's not good.