Been there done that...peewee football and cheerleaders.
Hot topics:
1. They will probably try to get you to work at your utmost capability or beyond without adequate administrative infrastructure. Get a copy of your contract and see what level you are working at. Insurance? "We got you covered"...hah. Have someone else with background examine your contract. I'll bet you a quarter they list your duties as "first aid". They will not be trying to screw you, they are just trying to save money and their experience will be that somone was willing to do this in the past. Even if you are "only" doing first aid, you will be bringing training and eyes to assess and initiate proper treatment.
2. Need to preplan documentation. Do they have a standard form? If so, will it take you out of action for the rest of the day to stop and fill it out? (And don't you dare let them do it for you, ever). When you make your pre-employment visit to your responding EMS provider to make sure about their response time, historic relations with the event, etc., ask them for a copy of their information form and ask if you can, say, make xeroxes on a different color paper or some such so when you hand a pt off, the info is all there for them? And keep copies for yourself. Once you get that first dollar, Good Sam just left the building.
3. OK, assuming you take this gig, some stray shots:
ASTHMA: what-if? Going to happen. Sticky issues, giving meds, even with a parent's approval form.
Resist people trying to pressure you, especially transporting in POV's. People get excited and even aggressive. Some freeze up. Know what to do, calmly insist that the right thing be done while you are doing it, and never hold off sending a peds sports injury pt out. Keep track and officially advise the boss when a trainee leaves that you say they must have a physician's release to resume play if that is appropriate.
Get in tight with whoever is running the gig. Be proactive, be everywhere, help prevent injuries and heat exhaustion etc., tip off the boss when things are getting dicey. There are standards for exercise based on air quality, temp, etc., and if you can keep them on the right side of these rules, they will love you or fire you.
It can be fun, too. Dress distinctively so you are readily visible and findable. Be adult but have a sense of humor. Stock ScoobyDoo bandaids, My Little Pony, whatever, to boost morale in the event of an "owie". Carry some still- sealed bottles of drinking water, some kid or other will come without water and need it, cheap insurance and a kid pleaser. A length of O2 tubing will convert a standard drinking fountain into a water bottle filler. (So will stethoscope tubing...ask me about that later).
Stock for immediate treatment which will be of benefit in the time until EMS arrives, or in cases where EMS will not be needed...about 99% of the time. If therapeutic stuff like heat or joint-supporting elastic wraps are called for, this kid should be sidelined. Know what to do about asthma, anaphylaxis (who's allergic to foods, bees, sunshine?). Have the number for whichever child protective service you need to call if something bad is going on, as you can be held responsible and, ab ove all, it's the right thing to do. If the operation does not meet YOUR standards, QUIT.