That's a very open ended request, Alison. If you will be more specific about what you want to know, I'm sure you'll get lots of help.
Also, try running a search for things like "two stroke maintenance" or "riding techniques" or "break in".
As to maintenance, change the transmission oil regularly - maybe every 3-5 rides. Clean the air filter as often as you can - especially if it's dusty when you ride. Keep the chain properly adjusted and lubed. Check your tire pressure - there's a huge difference in how the bike acts between 10 pounds and 15 pounds of pressure.
Set the sag on your rear suspension.
You'll need to rebuild the top end (change ring and/or piston) with some regularity. I do it once in the summer and once in the winter - but I'm married with a child and a job, so I only get to ride 2-5 hours a week. If you ride a lot more than that, you'll probably want to do it more often. Anytime you see time recommendations on rebuilds and such, they mean actual total riding time on the bike - not the amount of time you were at the track or whatever. When I go for a 2 hour ride, the bike's usually actually being ridden for about an hour or hour and 15 minutes because of water breaks, etc. . . When I race, the bike gets about 15-20 minutes of time per class I race.