The golf is the easy part. Here is the rest of it, in order.
Two weeks out — open it up
Post the round with the course, the date, the first tee time and the cost. Open RSVPs and say when they close. The cost is the bit people leave out, and an unstated green fee is the most common reason somebody pulls out on the morning.
Three days out — close RSVPs and ring the course
Hard cut-off. Whatever number you have at that moment is the number you book. Anyone after it goes on a waitlist and gets in only if somebody drops. This one rule removes most of an organiser's stress, and it only works if you hold the line the first time somebody misses it. Hold it once and you never have to again.
The night before — draw the groups
Mix them. The temptation is to let the same four play together every round, and the clubs where that goes unchecked split into two clubs inside a year. Put the new bloke with someone who will talk to him. Keep the slow ones off the last group if you can.
Send the sheet out with names against times, not just times. People want to know who they are with.
On the morning — get there early, hand out one thing
Arrive before the field. Deal with payment in one place, once. Give every group a card and one clear instruction about who is marking. Scoring falls apart through ambiguity about whose job it is, not through anyone being bad at arithmetic.
On the course — do not chase scores
If someone is entering live, let them. If it is on paper you will get it at the end. Chasing groups mid-round for a running total is how the organiser ends up playing worse than everyone else, every single time.
After the round — finish it that day
This is the one that matters. Get the scores in, work out the result, post it while people are still in the car park or at the bar. Not Tuesday. A result posted three days later has lost most of its value, and the round after that is where your RSVPs start slipping.
Post three things in one message: the leaderboard, the season standings after it, and the date of the next one.
Next morning — the boring ten minutes
Reconcile the money, write down anything that went wrong, and book the next course if it is not already booked. Skipping this is how a club arrives at August with a $60 hole in the float and no tee times.
Do that eight or ten times and the club more or less runs itself. The part that never runs itself is the chasing, which is its own subject.