If I go off the edge of the map in this one will it cause problems?
I'm not sure there's a concrete answer for this. There's the possibility that the more areas that get explored the more load it puts on the server. I have no idea to what extent. As for going off the edge of the map, I'm not entirely sure there is one, or one that can be reached in a practical amount of time. Odds are you would get yourself killed long before you ever reached it.
That being said, there are several outposts already placed a fairly long ways away from the central spawn point. You might try visiting one of those and then decide if you really want to explore any further.