For the equine paste, you would give them a "bee bee" sized amount, a one time dosage, squirted down the beak.
As for how often to do this, and as stated above, it all depends on the cleanliness of your facilities, are they on the ground, caged, etc...If you run a tight ship, and keep things very clean, then once a year will work. Twice a year if you are a bit lax or if you keep quail on the ground.
You can always get the quail poop tested at the vets office to see what type of worms you are dealing with. If you are only dealing with the most common of worms, the Round Worm, than a one day treatment of Wazine in the water will do once or twice a year.
Oh, and welcome to BYC!