I did an install as CD instead of doing the debian one.. will break easier if making changes to config files?

1. how can I change resolution of 800x600 to 1024x765? I could not find anything relating to resolution on etc/modconf file..

2. Why when I end session does it jump right back into desktop?

3.can I change it to debian without messing up my current setting? I spruced it up real nice.. it looks even better than Vista LOL. I'm in love with Knoppix