Silvergroover, welcome to the 'Nuthouse" a warm & fuzzy place with a difference...
Glad to have another victim aboard this rocky little ship, especially another biker type person
AS for getting yourself a suitable machine, as Chris says, try find one that you know the history of rather than getting something from the classifieds....The water is very murky out here with very little chance of any comeback if you get a 'pup'....
As for the track, the sand is an issue but the AD does have a blower which they clean the track with as and when needed....Usually the cars clear the track before the bikes go and therefore it is not as bad as you would think but, off line it can be like riding on marbles
A 600 would be the perfect bike as the bigger bikes are not that much quicker in most cases. The race guy's make them shift but there are only a few of them out there, track days are more controlled and therefore any size is OK as you will find a group that suits your ability
Good luck and happy riding mate
