Some good info in there, but you are dead wrong as well. A 3 month old dog isn't old enough to show interest in Frisbee? You can't be serious. You also stated that Izzy will naturally chase anything thrown when he gets older. Where are you coming up with this stuff?
I have known plenty of puppies that loved Frisbee at a very young age. I also know BC's that have no "natural" desire to chase anything, even as adults. Every dog is different.
The best way to get your dog excited about Frisbee is to start ASAP. With puppies, I would recommend throwing slow rollers. This helps eliminate jumping at a young age and lessens the chance for injury. Walmart sells something for 5 dollars called the "Flippy Flopper". It's a great starter Frisbee for a dog. It will hold up fairly well, but don't let the dog have it while unsupervised. The Flippy Flopper is made out of fabric, so it is easier to catch. We have a few of them and they are great for playing indoors as well as outside.