I’m sure not a marine VHF expert but I’ll pass on some basics. Channel 16 is reserved exclusively for hailing another vessel and distress calls. Once contact is established, it’s recommended to switch immediately to a working channel. The five channels designated for non- commercial ship-to-ship communications are 68, 69, 71, 72, and 78A. The call format is simple. Typically announce the name of the vessel you are hailing twice followed by the name of your vessel and say “over”. “Over” means you’re finished talking and waiting for a response. Their response to you should be your vessel name followed by the name of their vessel, and “over”. At that point pick one of the above channels to continue the conversation. ie “go to 68, over.” When done with an exchange on any channel saying “out” when you’re finished with your conversation theoretically allows other people waiting to use the channel to know they can use it...good luck with that. Etiquette, if followed, says 2 minute wait between unanswered calls with a max of 3 calls, then a 15 minute wait before starting again just to keep the frequency open. With improved cell coverage at the lake, I think many give texting a shot first, resulting in decreased radio congestion. I get texts in places on the lake that definitely do not have line of sight to the cell towers.
Another option for communication with other boats in your group is using family channel radios, where everyone picks the discreet channel to monitor in advance.
In the past, unfortunately by experience, I know Executive Services has monitored ch 10 for towing requests if you want to call them directly. That may have changed.
+1 on using the WX 1 channel for area weather forecasts.