[TYPO3] RealUrl and configuration of extensions - Where can I learn about this

[Frandsen]

Dear all

I am no good at php, but I am very fond of T3 and realurl, I just have 
big problems at modifying the rewrite so that other extensions works. Is 
there somewhere that I can study and learn how to set up the rewrite, I 
think of the fixedpostvars, postvars and so on in the realurlconfig? I 
need something with a bit text explaining what to be done.

on my site www.hd-a.dk (danish) under download, the "upload" does not 
work for example, I have tried making a fixedpostvar

  '60' => array(
             'GETvar' => 'tx_mxfileupload_pi1[action]'
          ),
       ),

but of course this did not work.

I would really appriciate if you could recommed something, where I can 
get better at realurl

Thanks

Søren Frandsen