FIM GalSync Run Profile, Two-way Synch

Hello, may I ask a few questions please;

1. How is the Run Profile order to creating contact with FIM Galsync? What is the best practice on this subject?

1. For the xyz mailbox at the Contoso Forest, the contact will be formed as xyz created at Nevada forest. I wonder, if this contact will be deleted when the mailbox at Contoso forest? Or, if any changes made on the mailbox are these information updated automatically on the contact in Nevada?

1. There is a sync as: Contoso Forest,Mailbox --> Nevada Forest, Contact. To make just the opposite of the above, do we need to set up FIM at Nevada forest?

Thank you in advance.