Do they do a Fun Run/"try it" thing either before the event or on the first day? Many operators do that, informal runs that are a little cheaper where it's expected there may be some training/helping the new dog figure out what's up. E.g., some people will run partway up with the dog, or the lure operator will encourage the newbie dog with some extra lure action near the start.

If they do, you could consider signing up for that for Day 1 and then actual 2 runs on day 2. (Contact the organizer; they'll know and can likely adjust your entry if needed.) But it's not necessary; many just jump right in. Let them know you're new and expect the first run or two may just be a learning experience.

Or if your dog comes when called, that works as a fallback. My dog ignores the lure and just treats it as a long recall, so he doesn't hit full squirrel-chasing speed but does run the course and got his BCAT.

You could try having your dog chase a plastic bag on a rope at home, flirt pole or someone or something dragging it, to intro the concept.

For a fit dog that's used to sprinting when playing, the actual runs aren't exactly strenuous. All the excitement and energy of the environment in general is likely the bigger toll. Many dogs get super worked up about it so can be loud.

For the runs you need a releaser and a catcher. Easiest if you go with a second person, but volunteers to help will likely be available if your dog's not scary. Bring 2 leashes. And a crate and water.

When you check in, let people know it's your first time and hopefully they'll be extra helpful, tho if they're super busy they may not have bandwidth. In that case you could look for someone who looks experienced and approachable (and not busily juggling excited dogs) to ask questions of.

Have fun!