Help with making a mass gain diet for teens

I've been wanting to make a real mass gaining diet plan lately with macros instead of just counting calories. Counting calories has gone okay but i want to make bigger gains and lose just a little body fat too. I have a couple problems though. First thing is that I can only have 4 meals a day because of school. I'm planning on doing a six meal plan during the summer but with school thats all i can do. The second is that I'm not going to be using supplememts at all so I have to get all my nutrition from just food.

So the real problem I'm having is actually making the plan, specifically the portions. I'm basing my plan off "Kris Gethins 12 week daily trainer" off bodybuilding.com. Im trying to convert that into a 4 meal plan without the supplements and to my specific macronutrient and calorie needs. For me it's been extremely hard trying to calculate how much of a certain food i need in one meal based on protein, carbs, fats, etc. If someone give me some tips or guidelines on doing this or link me to a post about this it will be greatly appreciated.

If you know your daily calorie and macronutrient requirements, you're done.  Divide that up into however many meals you want, as few as 2 or as many as you want - it doesn't matter.

If you are a full time student, I suggest eating a decent breakfast, a big lunch and a big dinner.  Or skip breakfast, eat a moderate lunch and a huge dinner.  Nutrient timing has been found to be mostly irrelevant as long as your daily requirements are at some point filled.

You can do whichever you like best =)  I personally like to have high protein and high carbs post-workout, and high protein and high fat intake when I have a long time between meals, as fat slows digestion/absorption rate.

You can also split macros evenly between meals - like I said, whatever you like best.