My F3 is six months now, and I've been feeding him mostly raw chicken thighs which I grind, raw fish- smelts I buy from a good fish manger-, and the I buy 1 week old quail and hopper sized mice from RodentPro. I also have a bag of pinkies from them too.
He LOVES mice and quail. He would eat them and nothing else if he could. But, after asking the same questions you asked, I started with some raw chicken with my own additional supplements like egg yolks, taurine, vitamin b12 and e, and krill oil.. Sounds like a lot, but its really not too bad.
I would definitely recommend RodentPro, and I'm about to buy another set of mice and quail... All a size larger than got before because I think he can handle them. But you should start with the small critters and see what happens. Pinkies are really small, and my cat eats them without chewing them. The pinkies are the size of about half of your index finger. Hoppers are two to three inches, and my cat chews them for about 30 seconds before they're gone. And the one week old quail are about the size of a small fist.
Try them out... Shipping is killer, but together with the cheap prices of the mice and quail, they're less expensive than buying from the pet store.