I've never used Ext.js and have no experience with OO Javascript.
But I would REALLY love to use Sencha Touch for this interface, but have no idea how to start with this.
I know if I could get a little jumpstart, I'm sure I could figure out the rest through the api documentation.
The place to start is at the beginning. Find a book or tutorial on OO javascript and read until yours eyes turn red. Then start looking at the Ext and Touch APIs. Then look at the example code. Repeat.
I agree, it would definitely help a lot to understand some of the basic principles of OO javascript. Dustin Diaz has written a good book on that if I remember correctly.