Starting simulation with WRF-CMAQ two-way online

Dear all,
I am very new with WRF-CMAQ. So I need your advice regarding how to do a simulation. What kind of data should I have, and where can I download them. I also need to know about step by step of simulation process. Is there any website or user guide to help me please.
Many thanks in advance,
Kind regards,

I did not run CMAQ before, this reply may be helpful for you?