Go be a normal high school student, overprepping to injury or mind failure is all too common. Gain real life experiences without getting in any real trouble, be well rounded - mentally, physically, emotionally, academically and spiritually - be flexible, be tenacious and be too stupid or too brave to quit. That is everything you need to know, besides the packing list, that will be sent to you if you pass the initial physical/educational testing and finish Basic, AIT and BAC.
Welcome - please follow the first sentence of this post in exact detail.