The moon is at infinity which gives you pretty much unlimited DOF at any f/stop. So I'd think you'd want to pick one somewhere in the middle like f/8, or where ever you think the sweet spot is.
You want a fast shutter speed because the moon is hurtling around the Earth at a pretty good clip. I'm sure an astronomy site would have the info.
But anyway, using "sunny 16" (because the moon is being lit by the sun even if you aren't), if you are using ISO 100 film the correct exposure at f/8 would be 1/400th sec.