Hi and Welcome....
First good for you for choosing raw. It becomes easy and fun. But to start - take it slow.
It's usually a good idea to start on one protein source for a couple a weeks until your dogs adjust. Most people start with chicken because its easy to find and usually pretty cheap. For Athena chicken leg quarters would be a good size for her. And for Hannah you can start her on chopped up bone-in chicken breast. Check out http://www.projectmutt.com/index.php/nutrition
- there is a really simple breakdown for starting raw.
Once your guys stabilize you can start adding more variety. But in the start go slow and enjoy.