You'll need 200 pounds of seed per acre, so 44 x 50 pound bags.
Oh, and that's assuming you core aerated, if you didn't you might want to try 400 pounds per acre
but I would highly recommend aerating because without that the new grass roots won't have no depth,
soon as the heat of summer hits or we get a heavy thunderstorm...
Being that it's 11 acres I would probably allow the use of a tow behind aerator.
CORE aerator, that is.
Mow that stuff high, like 5-6 inches.