Congrats and I hope you enjoy it. Coming off a larger side by side w ith more suspension, I have to admit that the P500 was a little different initially. Now after having it and realizing its strengths and weaknesses, I will say it is an awesome machine that is very sporty and fun to drive.
Accessories are fun on a side by side. During the summer when its hot and sunny, the roof has been my favorite accessory. During the winter a windshield or half windshield is nice, but they will cause more dust problems when dusty in summer. Two of the best modifications I have done were 26" tires on 12" rims that are offset a little more and removing the anti sway bar. The tires give way better clearance and a little wider track. I felt like this helped with stability and side to side shaking on bumps. It helped it ride a little smoother (probably because the tires are quite a bit larger). I was skeptical about removing the anti sway bar but after reading that many had done so I figured I would give it a try. The stock suspension is so stiff and little travel that it can't really dive in corners anyways. After removed it rides better and makes it way more enjoyable on rocky trails. The suspension articulates a bit better (although still rough) and makes me enjoy owning the machine more. It also gets better traction up rocky trails because the wheels stay on the ground better.