When you first start growing you'll probably only get an ounce or 2 dried and cured per plant. You'll get better as you go. SO you usually have about a 4 month ccycle from seed or clone to dried and cured. So with six flowering plants you should be able to easily get an ounce and a half per month and probably closer to 3. There are lots of different styles of growing as you'll find out when you start reading and as your education increases so will your production.
And then again you might just get lucky and hit the righ combiantion 1st shot and get 5 or 6 ounces per plant.