I want to get really muscular. How many times a week should i work out?

I'm only 120 pounds. And everything i eat just seems to do nothing to me. I'm a 18 year old guy and i want to get really muscular. How often should i work out and what proteins should i be taking? I'm not very good with the body building stuff or things i should and should not eat.

And do i have to take a type of weight gainer maybe?
Work out every other day. Your body needs time to recover or you are justt making it weaker. This is because when you weight train you break down the muscle and your body realizes it needs to be stronger so that won't happen again. Hae some protein such as a burger or chicken sandwich afterwards. Carbs in things like pasta would also be good. Don't use protein pills they are pretty much fakes and a waste of your money. Drink water beetween exercises on hot days. You sound pretty small for 18 so I suggest eating a litttle more or if you really are just natturally that small make sure to start out light on the weights. Unless you are competing eat whatever sugar you want, you will still get stronger, just not be a physicly healthy. If you don't have the time work out three days a week, Monday, Wednesday, and Friday but every other day which is basicly alternating 3 and 4 days a week would be best. If you work out two days a week you will not get better but will not get worse. Hope this helps and good luck getting stronger!
dont bother with all the protein powder crap you can buy, at your age and weight combined your body prolly wouldnt metabolise it properly and you would be wasting money. the best thing to do is just work out every second or third day and eat meals that are healthy. try eat more meat and carbs bread,rice,pasta etc, than ususal but dont go over the top. when you start seeing yourself put on muscle then get more serious and look at a more specific diet. pushups suck, but are awesome for putting on muscle effectively as they work most muscle groups in the body and they dont take up too much of your time. i had a friend that went from steven hawking looking to pretty buff in 6 months of doing up to 300 pushups every few days. gd luk
You're pretty small right now. But if you're serious about this here's my suggestion.

Lift four days a week hitting every major muscle group once. Eat a lot of food, but make it healthy. Try to eat five or six smaller meals, instead of 2 or 3 large meals. Of your daily caloric intake, 25% should be protein (try for 1g protein / pound body mass), 50% should be carbs, and 25% should be from fat. Note that 1g protein, 1g carb has 4 calories, 1g fat has 9 calories. Do high intensity cardio at least a few times a week.

As for supplements, try GNC Whey Protein Isolate. Also, I've never used it but I've heard great things about NO-Xplode.