Hi,
have you already tried to look up the documentation for finding some help concerning your problems? You can open it by typing the command:
doc lqg
doc lqr
doc lsim
etc in your command window. As far as I see, the documentation should help you with at least half of your questions, maybe more, if you have a closer look. If you still need help afterwards I can try to help you.
Cheers,
Wine