Since you are on the JV team, I take it your no older than 14-16 years old. In that case don't take that Animal Pack crap. That stuff could probaly cause you problems. You shouldn't be taking that stuff unless your 18-20 years old and have a healthy diet. If your looking to gain weight then eat large large amounts of calories, carbs, fat, and protein. Eat 500-1,000 more calories than what is recommended for you to maintain your weight. Eat healthy and clean. No big macs or whoppers or fries. No junk food. Make it so that 90% of the food you eat is clean and healthy and the other 10% can be some junk. Your diet should consist of something like this:
Red meat
Orange juice
Eggs
Milk
That's it. Also, you should throw in some fruits and veggies in there. But that's mainly it. I'm pretty sure you know what red meats are. The other 3 are self explanatory. Just make sure your lifting hard and eating alot of those 4 foods and I promise you that you will gain weight(muscle). Also, don't worry about any of those supplements. The only supplement you should be taking if any should be multi-vitamins.