Protein Powder wont do a damn thing for you. The number one thing to do is work out; if you increase your caloric intake without working out you'll gain weight but it won't be "quality" weight.
1. Work out
2. Eat beef, chicken, whole weat pasta, sweet potatoes, oat meal, and fruits and veggies.
3. Have 2 or 3 protein shakes a day at most BUT do not use them to substitute a real meal.
4. Get plenty of rest.
That's it.. There is not magic trick to it, no magical powders; even steroids won't do a fucking thing unless you follow the steps. The above it what will get you some size.
You can detect right away those that are going to be shaky, and that will fall behind and those that are very hungry, and that hunger you will have to develop. You gotta create a goal for yourself whatever that may be, a short term goal and a long term goal and you gotta go after that. And if you donít see it, and if you donít believe it, who else will?