This is a good place to start....
http://www.dvdrhelp.com/

Look in the left hand columns at the ' How To ' guides.

The problem that I had was an Xvid file that had a ac3 soundtrack and the
necessity to....

http://www.dvdrhelp.com/forum/userguides/140703.php

Even though the above is to convert it to VCD I am sure that you will find
something on that site to help you.

HTH

Morgan