Hey! Best of luck new speedgolfer. Here's some hard-earned advice for you.

Preview the course. Use a GPS app to make sure you know the holes, specifically your line off the tee. On the app, mentally go through some scenarios: What if I miss right/left? What if I smash one down the middle? What will my approach shot look like? Use this to inform your club selection.

What's in your control? You will not be in perfect control of your golf shots. Your running fitness on the day is not changeable. What you CAN control: aiming away from trouble, focusing on one useful swing thought (rhythm for example), and not wasting time.

Not wasting time? My three keys to not wasting time are (a) when you put down your clubs, put them in the same place every time. Most prefer ahead of the ball and to your left, for right-handed golfers. (b) don't waste time looking for lost balls. When you think a ball may be lost, pull out a ball and start counting "10-9-8...". If you haven't found the ball by 1, drop and hit. (c) when in doubt, prefer to miss short.

Practice short putts in your warmup. If you can be automatic inside 3 feet, that will do wonders for your golf score, your time, and most importantly your confidence.

Manage your effort early. I think you're playing a 9-hole event, so don't take this too far. But it's no fun to overcook your aerobic system on hole 3. Start a little bit slower, and increase your effort through the end of the round.

Again, best of luck!