http://www.cboe.com/micro/VIX/vixintro.aspx
http://vixandmore.blogspot.com maybe start with http://vixandmore.blogspot.com/search/label/educational
http://sixfigureinvesting.com/ has quite a bit about VIX and VIX linked ETP's
I'd start with understanding that you trade VIX futures and not VIX index (VIX spot) and that options on VIX are options on the respective future and not on the VIX index, why futures are in backwardation and contango (and what that means) check vixcentral.com for a nice view on the VIX future term structure and historical VIX future prices.