Welcome to QlikView Community. I'd recommend reading following from sources :
1. QlikView Reference Guide
3. QlikView Help
4. Read QlikView blogs (Rob Wunderlich, Stefan Walther, Steve Dark etc). There are many blogs which have some invaluable content.
If you need some video tutorials then you can check my blog : www.QlikShare.com
I'd recommend contacting QlikTech training if you need course material.