Just make sure the factory wax job has no dry spots, personally I would just ride it as it is. Do not bother detuning unless your first day is going to be all park and rails. I love the feeling of new sharp edges, but I do more freeriding so
Other than that definitely learn to wax your own board, it's super easy and just takes a small investment in the proper tools and a good quality wax. By the time you run out of wax it would have definitely paid for itself compared to taking it in for waxes.
Tuning depends on how much you ride and wear down them edges, usually once a year is sufficient. But if you only get maybe 5 days in a year of riding you don't really need to worry about it until there noticeably dull.