Steadying tips

You can also hand toss the birds when you want a flyer and teach the dog to stop when it sees the bird.  You can also tape wing the flyer when the dog becomes reliable at stopping when the bird is thrown, then you can send the dog for the retrieve.  If the dog is easy on the bird, you can recycle this bird over a period of time.  

When you are tossing the flyer, the dog will not quarter well because it knows that you have the birds and you are going to toss them.  That is OK.   Don't fuss at the dog to get it to quarter.  You are teaching it to watch you and stop on a flyer.  No need to confuse the dog with trying to teach several things at once.    As the dog learns this routine, you can plant a couple taped winged birds in the field for the dog to find and not toss a flyer.  You can use the taped wing birds to help teach the quartering pattern and keep the flush hard, and then mix in a hand tossed flyer for a steady opportunity.  

I feel that if I have the birds and the control of when the dog finds or sees one, then I stay the focus of their attention and they think I really do provide all of their "fun".    When they think they can go find their own "fun", the control power starts to change a little.  They will figure things out soon enough when you start hunting wild birds. 

Lots of ways to get to the end result. 

Thanks, and HT to SpringerDude