Around 1.5 grams of protein per pound of bodyfat is the norm. Eggs, canned tuna, and deli are good, quick sources of protein. Chicken, beef, fish, and if you can get it, ostrich or buffalo meat, are great for meals that would take more time to prepare. Red meat is especially good since it has healthy fats in it, and not only are those sort of rare to come by, but it can get hard to get enough.
For really small snacks, nuts and sunflower seeds work great. Look at beans too, although I don’t know which ones are worth it or not. John Berardi does have a chili recipee he swears by though, so they must be good.
After a workout, eating a meal high in carbs and protein is most beneficial. I eat oatmeal with protein powder (add non-fat or whole milk or w/e for taste and consistency). Ideally, you’d have a serving of Surge immediately after you workout, and something like that oatmeal about 30 minutes later. But you’re 15, I don’t know how important Surge is.
Finally, if you’re not eating protein with every meal, you need to re-assess what you eat.