Best of luck pal, I am certain you'll have fun on your first day playing airsoft!
I remember my first time heading to the skirmish site (wasn't this long ago), went all by myself all anxious and not quite knowing what to expect only to find out just how friendly and approachable my local community is! I have also made 2 friends pretty much on the spot by having a spontaneous chat prior to the game starting, ended up playing along both all day and only to join them for basically every game ever since.
Plus skirmishes are indeed a great way of maintaining a decent level of physical activity - in my case giving me a dopamine kick after a week of home based work behind my desk 🙂