Welcome!! Before attending your first day, please be sure to read our Riders' Manual: http://www.n2td.org/wp-content/uploads/2015/06/N2-Riders-Manual-Ver.-2.0.1.pdf
It gives details on bike prep and gear requirements, that way you show up prepared and ready to rock! There is also a ton of other great info in there as well.
Then ask away with any other questions, we're all here to help, and we were all new once!
What tracks are you looking to ride?
Another tip is to work on one thing at a time. Don't try to put it all together from the start. Definitely get with a coach at every opportunity, on and off of the track.