2. How can i change the resolution during startup so i dont need to reinstall Linux everytime i change the resolution?
I am not sure about RH9 but in most distro you can change X settings by either manually edit /etc/X11/XF86config, or by running xf86cfg as root. I prefer to run it in text mode which is
# xf86cfg -textmode
TIPS: If you cannot get into the graphical login, try switch to other consoles by the keybind "Alt + Ctrl + F1". You can log in there as root to change the resolution.