Hi Roman,
Well, there are alot of simple examples in the link I gave you. However, since you are new to Qt, you could start with this,
http://developer.symbian.org/wiki/in...Qt_Quick_Start
Once you have the basic idea, you could pick up an example from the wiki and try it. Remember Nokia Qt SDK also comes with examples.
Watch this video to know how to proceed with Nokia Qt SDK, if you should.
http://www.youtube.com/watch?v=Sd_07...layer_embedded
Regarding signing, I don't think as a beginner you would need to worry about signing by Symbian, self signed files must suffice your cause.
Regards,
Pankaj.