listen to the people who have been doing the job without you for years.
Never ever touch a map
If you really think something needs changing, ask why if its been tried your 'new' way. (usually it has and that's why we are doing it this way)
No, it's not. Was one myself. Lot's of good advice above, I'd add that you must form a solid working relationship with your SNCO. Give him plenty of rope/scope/respect, but remember the buck stops with you! And I'm not being funny now!