Post-installation questions

[nitzw]

Hi,

I was trying yesterday to change the permissions on the Boot file to make the timeout 5 seconds instead of 10 and to define a better resolution for display. Well, I haven't succeeded at all at changing the permissions... At this point, you probably know I'm a newbie

I was logged as me. I tried several things to finally make a potential mistake:
chmon -R MyName:admin /*

I presume that this command changes the ownership of all the files to me, of the admin group. Well, my system doesn't boot anymore. Am I right to suspect that because somes files are no longer own by the "system" user, there are problems? So here are my questions:

1- Can I revert to command or do I need to reinstall the OS?
2- How in hell do I change the permissions of a file when I'm logged as me?
3- What's up with the "root:wheel" I see in every examples I find on the web... "wheel"??
4- I know there are tons of post about this, many old, which is what makes it very confusing, but what do I have to do to make the OS recongnize my AGP ATI Radeon 9800?

I use Zeph's 10.5.2 rev.2 release.
Thanks a lot!