Abby's been on raw almost all her life, and she's almost 4. Like Dukesdad said ... the bigger the "piece" the better, it will force him to chew it ... slow him down ... don't worry about choking, dog's mouths are designed to eat bone and meat and tendons and all that gross stuff (I'm vegetarian, and I find it absolutely disgusting to cut all this up for Abby, but hey! You do what you gotta do!)
Find a butcher that will help you. I go to a lebanese butcher and he's awesome. I do know he thinks I'm a bit nuts b/c I don't eat meat and what I do buy is for the dog, but hey, he's always got a big smile on his face when I come in to his store!
I was there on Saturday and I got 10 pounds of meat / trimmings for $20, a huge bag of bones for FREE and 5 pounds of organs for $10 ... got home, portioned it all out and I have enough food for 12 days ... pretty cheap if you ask me!!!
Best advice - keep it simple ... don't worry about making "recipes" to keep your dog happy ... if I put food down and Abby doesn't eat it ... it's off the floor in 20 minutes and she gets NOTHING for supper that night. And she's only fed once a day ... so she's going to be really hungry the next night! (The ONLY concession I make is if she's chewing on a bone, then I'll wait longer.)
I will confess that I am in the room to watch Abby eat to make sure that all is well. But, I don't hover over her ... I have parrots too, so I bring Abby's food into the birds room and put in on the floor (It's linoleum so easy to clean!), and I'm on the computer ... she eats while I'm playing ... I can hear her eating and if anything was to happen, I'm right there ... I'm NOT watching her like a hawk!
Dogs are more likely to choke on kibble b/c they inhale it ... they HAVE to chew the bigger pieces of meat, especially those with bone in it, so it foces them to slow down ...
STAY AWAY from dense bones (like thigh bones from cows) ... they are ok to let them get the marrow out, but don't let your dog chew on it for hours, it will dull their teeth (I didn't know about this when I first started and Abby's canines are not "sharp"

Have fun with it! Once you get the hang of it you'll be like Keymo's mom ... checking out all the sales and having a field day seeing what your dog will eat! If he's anything like mine ... he'll eat anything!!!
Abby's favourites - cow's tongue and brains (it was REALLY funny watching her chase these two around the floor trying to figure out how to "chew" it!)
Marion