Hi, I'm physical education master's degree student, already finished my bachelor degree, having certificate of fitness instructor (no problem to show you, if you're interested), working in a gym for 2 years during studies and writting a thesis focused on nutrition suplements at the moment, so... I think I'm exactly who are you looking for :) If you would be interested about my offer, I will, obviously, need to know more details such as how many fitness programs you need to create (according to trainee's level, previous experience etc) and the same with that nutrition plans (as you said, divided by age, sex, goal, atc). For more information check my profile or feel free to ask anything more.
Best regards
Lukas