Ellie is my first hunt test dog, so I'm still a new person. Just remember that most people are very welcoming of new people to the sport and if you smile and are friendly and introduce yourself you'll do great. Be clear that you're there to learn and watch everything that goes on so you can start learning to step up and help with the work there. Throwing birds can be one of the best things you can do to learn because you're out there in the field and can see what the dogs are doing out there when they do well and when they don't do so well.
Be observant, it won't take you long to figure out which people out there know what they're doing. Those are the people to stand near and ask them to explain things that are going on to you. Always be clear that you are asking for direction and tips, otherwise most people will be reluctant to tell you what to do with your dog. (I'm guessing most people have been burnt at some point so are usually pretty careful about giving unsolicited advice.)
Ask what training videos the club members tend to use most. If you are following the format that the seasoned folks there use it can make it easier for them to help you - example my group follows Mike Lardy's flow chart so even though I might watch other trainers' videos to get ideas, I have Lardy's flowchart and notebook as my main plan so that the main people who I ask for help and I are on the same page when I hit a bump.
Don't forget to stick around and help with clean up, you probably can't help a lot with set up , but everyone can help take down blinds etc. afterward. Be sure to thank the people in charge and let the people doing the work know you're grateful for the opportunity to be there. There is no substitute for experienced people who are willing to slow down and show new people the ropes, we owe them a lot that they take time to help us.
The things you don't want to forget:
A notebook and a pen to make notes on what you learn or want to look up when you get home. Keeping a training journal is key for continuity.
A long line if you are at all unsure of your dog's recall or obedience.
A crate to keep your dog safe when it's not his turn.
Bring kleenex, be sure that you take a potty break before you get there, ask if there might be a porta potty somewhere but don't count on it.
Bring plenty of water for your dog and make sure that you have everything necessary to keep him comfortable depending on the temps. Towel or chamois cloth to dry him off, a tarp for shade when it's hot,
Don't forget your own water and snacks and even a chair, and be sure you're prepared for the elements as well. Even in SC I often underestimate how crazy the wind is in an open field compared to my house in a close in neighborhood.
You will LOVE it
Don't be shy to ask someone to take a couple of photos of you working with your dog, it's nice to have them.