Showers are completely optional, but not usually done by students after PE.
The essentials - sneakers, extra socks, towel, deodorant, a separate sweatshirt just for outdoor PE class etc.
NO. School issued locks stay in the locker room and NEVER leaves the locker room without teacher permission.
Tell your teacher immediately. Also look in your general area as it may be locked on another locker. If students/teachers can't find lost lock the cost is $5.00 for replacement.
You are, as the student! Once your teacher issues you a lock and locker, you are responsible for all personal items.
Yes as long as it is NOT a keyed lock. Combination locks ONLY!