Welcome! Though I do have to laugh when you said you were too busy to act, so you're going to stage manage...
This website is still my absolute favorite source for stage management. Poke around and do searches for everything you have a question about. There are whole threads/conversations for just about anything. The big thing I think is to know that you'll be writing a lot of stuff in your script. Copy it single-sided, with wide margins if you can, and before you hole-punch it, think about your plan. I'm right-handed, so I actually put my script on the left side of the binder, and have the entire right-hand side to make all my notes. Usually I'll put a number within the script on the left, then a corresponding number on the right side with the "what" of the blocking. Since it's community theatre, I don't know how much you'll be able to get a groundplan, but that's also helpful to have on the top of every blocking page.
Best of luck,
Erin