Hello

I am new to this site and I have a question that I know has been talked about before but I would like help from the beginning if possible. I have acquired a Canon EOS 3 and would like to use Ilford SFX 200 film with a R72/89B deep red filter. After reading many forums I am confused...

Do I need to shoot at ISO 6 or 12 with the filer on?
Do I need to also set exposure compensation as well/instead?
What is best way to focus, manual or automatic?
I intend to shoot landscapes/panoramic so would normally go for F11, is this the same for SFX 200?
As well as the answers above an explanation would also be appreciated.

Thanks