I wouldn‘t worry about what weapon you‘re gonna get when you join, or what the food tastes like, or what life in the army is like overall, wannabe-infantry-guy.
Once you are loaded on a course, it‘s probably more important to look sharp, keep your wits about you, and be on the ball all the time. Sleep when you can. Eat when offered food. Pay attention in class and learn the drills, especially your infantry drills.
You will need to know a whole bunch of stuff to be an infantry soldier, and they will teach you everything you need to know. Just bring your ears and eyes, and emtpy out some space in your head to make room for it all.
Section attacks, defensive ops, tank hunting, 60mm mortar, act as a scout, the list goes on and on.
And yeah, try not to get stuck carrying the Carl Gustav.