I would tell them to be modest with their orders, i would explain all the different types of chems, mb, kd, is, IA, NW, ATD, TB, etc but i would recomend they only choose 2-3 of the chems to bring planetside, as to not waste to much time and power for the doctors, however, once its later on in the operation and docs are bored with nothing to do, then they can be more greedy with how many chems they order