Keep the rubber side down and congrats on the bike! Looks like a good choice!
May I suggest waiting until the course before you head out for any long rides? The course will teach you a lot of techniques, and allow you to practice them, without fear of dropping your own bike. That bike of yours looks pretty shiny, don't mess it up!
Also, see if you can get your hands on 2 books, Proficient Motorcycling, and Twist of the Wrist II. Once you start reading and understanding the physics of a motorcycle, you begin to appreciate how your inputs affect the outputs it gives you. Right now, feeling sore after a ride is somewhat normal as a newbie, but it usually indicates that you are too rigid and tight on the bike. Motorcycles respond best when given smooth, gradual inputs. If you're tight on the handlebars, you fight its natural tendencies and you pay for it with soreness. In the worst cases, it can cause you to have a lowside accident while turning or braking. Thankfully, a 250 will be very forgiving to you, so it's a good tool to use to get out of these bad habits and learn the good ones.
Keep at it, and enjoy the course! Hope to see you out there. Don't hesitate to post and ask questions, many of us are here to help! Of course, do as much reading, searching and research as you can first, to avoid asking questions that have already been answered.