how often are there track days, and how much will it cost?

I" would also recomend that you go to thier website for more i information or callthem and ask these questions

They have a calendar on their website, that shows all track days and costs.

Quite often, and they vary depending on who is running them. Wide open Wednesdays are pretty inexpensive and about once a month. NASA track weekends are a bit more, but you get more time. They are also about once a month. I'm sure other groups run them as well.