It's my understanding that the novices run in their own class no matter what they're riding. I think you have to hit 'graduated novice' before you get to run specific classes.
You will need to buy or fabricate a fluid retaining belly pan for it, but there are probably some ideas for making your own on the internet, or ask our Prez Troy, as he races the same bike. The FS450's are surprisingly quick bikes around Mission.