Question 088: Combinations

My son is 8 yrs old and goes into a few TKD tournaments a year. He is currently a red belt with black stripe and I was wondering what do you suggest for combination drills so he is throwing more than just one and then let the other guy hit you with three more kicks. Last question at his age to prepare for a tournament does a child that age prepare the same methods as a older teenage or adult fighter would? IE: Exercise program, cardio etc.