How tall are you and roughly how lean (or fat) are you?
Forget about "as fast as possible", unless you're fine with adding a significant amount of fat.
DeFranco's Westside for Skinny Bastards puts size and strength on high school kids for football. Pretty much exactly what you need.
This article has some solid tips. Basically make sure you focus on having plenty of protein, carbs, and fats; not trying to avoid any of them and not eating like a pre-contest bodybuilder; and eat consistently, 3 or more meals a day, 7 days a week.