My son is interested in joining the school ski team. I do not ski and know very little about the sport. I went into the local ski shop and they hooked me up with some Rossi world cup race skis. How do I tell if they will fit my son this winter because he is growing taller by the day? What items will he need to race with the high school? Does every bag fit all race ski’s? I need to start buying now so he will have everything he will need by winter. Thanks for any help and suggestions.