You should have been given the opportunity to configure your mouse and video at install. Did you not configure them then, or is it that the configuration you entered is just not working properly?
You don't need to create a file for X.org. You have two utilities that will better address both problems. As root go:
system-config-mouse [enter]
..for your mouse, and for the monitor:
system-config-display [enter]
Play with those, and tell me what you come up with. Those utilities *should* run without X windows.