How much weight lifting should I do to gain weight and muscle? I am 14 and 105 lbs and I have heard a lot that weight lifting helps gain weight, but how much of it should I do?
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Go to a gym.

Bench Press-

Bench the bar it is 45lbs (olympic fat end, skinny end is normal bar 35lbs)
if you can do 8 Reps add 5 lbs each side, repeat 3 reps and adding 5lbs each side till you can't do 8 reps or struggle.

This is your bench now do 2 more sets of 6-8 reps. Wait 1 min between sets.

Do that with deadlift, squat, bent over barbell row, and overhead press.

With deadlifts considering your new do only 1 extra set.

Now I would suggest if you don't have a spotter use dumbells, so you don't kill yourself.

Again grab dumbells and add weight till you strugggle to get 8 reps.

Dumbell Deadlift, Squat(or lunge), Bench, overhead press (or seated press, military press) and Bent-over Rows.

Now, you have your numbers. You know have to pick your workout.

Basic Set/Reps would be 5-Sets/5-Reps, 4-Sets/8 Reps, 3-Sets/12-Reps
Everytime you can do #Sets/#Reps the next week you add 5lbs of weight onto lift.

Basic Splits Full-Body Workout 1 or 2 times a week, Monday/Wensday/Friday (Chest/Triceps, Back/Biceps, and Legs or Back/Chest, Arms, and Legs) 3Days on 1 Day Off 3 Days on (again split the workouts).
You want to only lift per body part 1 or 2 times a week any more can result in injury

Then look into eating habits too. Mainly just go into the gym start lifting and read up, there are people lifting for 5+ years still learning the best possible way to excersise/and nutrition.

How tall are you? I would suggest the Scrawny to Brawny program for gaining weight/muscle.

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First of all you are to young for lifting weights (don't get my wrong) or going to gym. Wait about two or three year (that you are 17 or 18 years). Instead lifting weights, you can do push ups (every workout with your own body weight) etc...

stay at moderate weight, something you can lift for 8 to 10 or 12 reps, if you can do more then 15 reps per set then you need to move up in weight. you sound like an ectomorph, i suggest you consume around 3000 calories a day and 110-150 grams of protein. you can buy protein at walmart for 14 dollars, people will criticize it because they dont want to believe that the shit they blow 80 dollars on is not the same as walmart protein but protein is protein. it might not have as much of the other stuff but all you need is protein and carbs and fat. get your vitamins and potassium from fruits and vegetables. you can pretty much eat whatever you want but make sure you are eating over 2500 calories and you are getting your protein, when you lift dont just go with the motion, make sure you contract your muscles when you push or pull and use proper form thats how you build muscle. go on you tube and check this guys channel, he will tell you more. search PhysiquesOfGreatness on youtube

First make sure you can lift your own body weight that's how I started when I was your age. If you can't do 25-30 push-ups at mid-pace without stopping or 10-12 pull-ups then you shouldn't be lifting weights. Your core as to be strong first before all else, it will make a huge difference when you stat lifting.

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if you are looking to put on muscle (hypertrophy) the general consensus seems to be that the 8-10 rep range is best although going as high as 15 deffinetly has it's benefits in my experience. One key thing is to have workout sessions that are more focused and not working too many muscle groups that way maximum effort can be put in tearing the muscles to bits by using three or four exercises that hit one group in several different ways. For example I personally train weights four times a week and have broken it down in to: Chest/Triceps, Back/Biceps, Shoulders/Forearms and Legs/Core. This is a sample of my chest/tricep session:

Chest
Barbell benchpress 3x8-10
Cable Crossovers 3x8-10
Incline DB press 3x8-10
Push-ups 3xfailure

Triceps
Superset Skullcrushers and triceps press 3x8-10 for both exercises
tricep dips 3xfailure use negative reps if necessary

The idea behind using a rep range rather than a set number is that the effects throughout this range will be similar. I always want to be hitting at least 8 reps but if I hit 10 it means I need to increase the weight a little until I physically can't get that 10th rep. Pushing yourself to failure is vital when looking for good gains. I should point out this isn't the sort of program a bodybuilder would use but I'm a rugby player and I find this a good way of putting on good size whilst limiting too much fat gain.
Diet is in my opinion even more important however. in my book you can't ever get enough protein and some sources recommend at least 1g of protein per pound of bodyweight per day. Look to get it from good sources though eggs, meat, fish I have also found protein shakes effective and recommend Total Protein by myprotein although it is up to you whether you want to splash the cash or not. When putting on size Carbs are also key again look for good sources potatoes, brown rice and pasta are good and try to stay away from bread although a little never hurt anybody (excluding allergies).
Hope I've been of some help man.

It's not this simple at all lol. Look, if you want to gain some size, eat more. THAT will give you mass, and combining your nutrition with working out will give you muscles. You can't just walk in the gym for a month and expect a new body lol. Do some research through forums, youtube vids and fitness magazines before getting started.

I personally suggest to start at the age of 16, because your metabolism will be a better developed.

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