Wrestling is an interesting sport. It's about strength, agility...and strategy.
The first, you gain by an anabolic diet and training, as well as attention to proper sleep habits. You're curently gaining muscle by training, and apparently diet is supporting muscle mass gains. Youi can further those gains through the addition of fast uptake protein peptides by use of whey....within the exertion window, and during other portions of your day by eating small frequent meals featuring whole proteins, healthy fats and carbs divided between starchy and fiberous vegetable sources, and last from modest use of whole grains.
The second is also gained through training...but not necessarily standard lifting routines. You might want to ask in the training section for ideas on developing both endurance and explosive power. Key to your healthy gains in lean mass is the regular addition of aerobic exercise to your training regimine.
Pay attention to support system (muscle attachment to your skeletal system) to avoid injury, because you're still in the body accomodation period when this connective tissue is srengthened and toughened to various mechanical stresses. You can help recovery by use of a few supps later on, but at present, Roberts recommendation of whey is a good one - its enriched in amino acids that are anabolic and that promote correct glucose utilization - and that, is key to enhancing muscle and support system recovery from heavy training.
Its the coupling of proper nutrition, supplementing with whey and a training program that features both (aerobic) cardio (to optimize glucose utilization and the switch between fatty acids and glucose for sustained energy) and (anaerobic) strength training (to optimize muscle mass function and promote fatty acid metabolism). You need *fully* functioning fat and glucose metabolism in order to perform well and gain peak condition.
Strategy is gained by learning technical moves and through your coaches and your own natural saavy at sizing up your opponents technical style and weaknesses. Find an on-line wrestling forum to learn more - and study the biomechanics of the moves / holds used.
The reason I elaborate here: Many coaches encourage weight and strength gains, but push their athletes close to competition to "make weight" - loose excess fat and water close to weigh in through rapid water and fat loss. Thats what you DON'T want to do. Instead, you bring your weight up as lean as possible, so that weight adjustments are minimal - and so is strength loss. Try to increase your weight up at the same rate 1-2 lbs per week that you would lose it (if you were cutting), and you will find that your gains are solid lean functional mass, and relatively little fat mass and water gains.