Migrate Vbulletin to BuddyPress via bbPress

Working on a Project where we will move VBulletin to a new BuddyPress/WP Site.

What is the Process?

Vbulletin Import to BBPress then BuddyPress?

Confused on the big picture of how this process works. We are very familiar with Wordpress, but new to BuddyPress.

Thanks in advance for your input and advice.