Some advice for new professors I've always heard is to not really say anything during faculty meeting the first few years. This may seem a bit constraining but I think it's useful to think about how little of the department you really know. The history. When some seemingly simple issue is brought up it is the first time? Is it the 5th time in the last 3 years? You'd be surprised (or not) what academics can turn into years long grudge matches.
The other thing is that you probably don't really know anyone's work personality. Not if they seem nice or personable. But when it comes to dealings about your academic organization where are they on this chart:
Eventually you will figure this out.