Well figuring that a female could lay a first clutch from 4 to 10 eggs with the average being 6 or 7, and you have 11 females, how do you feel about having to feed 70+ hatchlings for upwards of a year or more as you try to sell them? You say you want 20 to 30 but could be pushing closer to 100 after one breeding season.
I would look very seriously at prioritizing your breeding plans. Look at what you might be able to selectively produce this year and how that would open up new directions with the collection you have for the next year and the next. You may find that some of the females are not needed after year one or year two because of what you produce. Glutting the market with animals you don't necessarily want or need right now, just loads up supply thus diminishing the demands and returns while causing you to increase your work load and expenses. It may even take some of the enjoyment out of it for you if it becomes overwhelming?
Just my $0.02 but you did ask.