The title is just a function of post count.
Vette Barn nOOb: 0-30 posts
Vette Barn Regular: 30-100 posts
Vette Barn Crew: 100-1000 posts
A Real Barner: 1000+ posts
The points and levels are part of the Experience add-on...Explore the Experience link in menu bar to see what earns points. I'm not exactly sure how the 100 levels are divided.