Looks like a nice bike!
Start with short rides, sure, but I'd reckon you could easily build up to 40 miles rides. I say that based on my own experience - I was doing that sort of distance within weeks of starting on a road bike.
A compact chainset is absolutely fine. A couple of the guys I ride with have triples, but they barely ever get into the bottom ring anyway, and most of us can keep pace on the hills on our compacts. If you're reasonably fit, as your running suggests you are, then you should manage fine with a compact.
i haven't used my bottom ring yet :/ i barely use the middle one! just switch between 3 gears at the back and thats it
You'll see people doing all manner of hand signals when there's potholes or slippy crud on the road or cars to go around or whatever... That and shouts of "CAR" anytime one creeps up behind or us or comes against us.


