carleydvm,
Just to start off, I am not the expert here. Chris and I are going to the March 31st and April 1st orientation, but this is how it went for us.
First you fill out an inquiry and send to Abrazo. Then Abrazo will send you an application (they may call you if they have any questions). Then you fill out the application and send that into Abrazo. It took our application about 2 weeks to get reviewed and then we were invited to the next orientation (3/31 and 4/1).
There is a topic called Orientation and I posted in that section to find out the next orientation date. It looks like they have one about every other month.
Hope this helps and maybe will see later this month.
Amy