By the way... you can start prepping for the track ahead of time.
The secret to having fun on the 250 is that the party starts at 9,000 rpm. The engine can handle it easily, so don't be afraid of high revs. The motor is capable of singing along at 12k all day long for years and years.
So as you ride around doing your normal routine, think about keeping the revs up. You won't break the bike.
Also... watch on-board videos of the track you'll be visiting. Use those videos as instructional tools. You can pick up a ton about the line and reference points from watching these.
Here's me at Palmer, running the "normal" counterclockwise direction. I had bumped down to yellow group, which is why I was passing so many people. It's a reasonable representation of the line. There are many many videos out there like this.
Link to original page on YouTube.