Congrats on your choice to volunteer for selection. The best advice that I can give you is to show up in good shape and to prepare yourself mentally and physically for the challenge that lies ahead. Selection is just the beginning, it is only about two weeks now, but don't take it lightly. Don't argue with your peers, be a team player, and lead when it's your turn to lead. It's a worthwhile experience and your training will continue well past SFAS, and throughout your career when you make it past selection. Good Luck, and don't quit!
"De Oppresso Liber"