I have similar issues in Windows 8.1, cannot easily make the screen
orientation to show correctly on DK2. Only worked once when somehow I
managed to extend the screen and use the Landscape-flipped mode!
I had the same problem, it was with Paypal and finally I gave in and
used my credit card even though I didn't want to use a CC. I think there
is a problem with international paypal and Oculus order, I had the same
problem last time.
There has to be some more free tuts. Unity is very popular now. I saw
some good tutorials on vimeo.com. Also there is this intro:
http://www.youtube.com/watch?v=R2kmi103tpU