Welcome to the Forum!!
You don't strike me as a gossip so that stops the drama from finding you pretty quick.
A adult barn is usually not a barn of children and teens running round thinking they run the place.
Find out who the barn worker(s) are, the barn manager and if you have question or issue take it to them according to situation.
If you don't know something, ask those in charge not
the other boarders for a factual answer.
I tended to stick to me when boarding...
I heard the conversations but rarely participated unless it was as congratulations for a earned accolade accomplished...otherwise, didn't mingle to much.
I second the sand clear if the horse will be out on sand eating from slow-feed nets daily...
Ask the barn manager if the barn has a routine day for administering the product and who supplies it.
Being spring is soon to come, you can also inquire about barn routine for vaccinations, coggins, worming and such they do or arrange for.
Same as shoe/trim schedule and if it is your farrier is there a sign board to add the name to?
Same as protocol for tack room...who has keys and access? Place to safely leave your equipment that no one else touches...if in doubt, don't leave it.
All that is needed is
a halter and shank.
Ask if the barn insists on a particular type of halter if left on in t/o or are they removed?
My preference is removed, or if left on it must
be leather so it will break under force exerted before injury/death occur.