@Psionic Fox, most canon characters will probably not exist, but I reserve the right to introduce some.
@GeneralBarca, as stated by another, the pdf exists at Narutod20.com, there aren't actual books, just pdf files available for free download.
@Baleful Savant, Most Bloodlines and templates are fine, the one I'm particularly against is Jinchuuriki. Concerning the curse mark, I'm not entirely sure what that gives you, and will have to look it up, remind me to do it in your next post if you'd like, I'm just running out of time now, and since you asked about later, I deemed it low priority.
@General Barca, you can take class levels in any advanced classes you meet requirements for, but generally have to start in a standard class to meet the requirements, usually you need a minimum of 3 levels in a basic class to meet the statistical requirements of advanced classes, sometimes more.