Hahaa your trying gain weight and Im trying lose! You can have some of mine lol!
Anywho I would say eat more foods with high caloric intake, and more protein and carbs. Eat at least 5 or more meals a day. Avoid Caffeine and Nicotine
Caffeine and nicotine are good stimulants and help to increase the metabolism of our body. Avoid having these stimulants in excess quantity to help your body retain maximum nutritional value from what you eat.
Hope this helped a little:)