Discussion Board for collaboration on QlikView Management.
It 'best to use the official reference manual Qliktech, or some third-party manuals?
Beside using this community:
QlikView 11 for Developers
Barry Harmsen und Miguel Garcia
Maybe start with the tutorial (downloadable) and then proceed to QlikView 11 for Developers?
definitely with the book qlikview 11 for developers.
+ Reference Manual.
Try the online videos on Qlik's main website. There are also a number of very good blogs out there with more help, advice and training vidoes.