Quail lay eggs.
He says the space to grow 1 bushel is:
Field corn, 10' x 50'
Sweet corn, 10' x 80'
Popcorn, 10' x 80' (regular ears; not necessarily strawberry type varieties)
Oats, 10' x 62'
Barley, 10' x 87'
Rye, 10' x 145'
Buckwheat, 10' x 130'
Grain sorghum, 10' x 60'
Wheat, 10' x 109'
He says these are just ballpark figures. Weather, variety, knowhow make a lot of difference. A really good wheat grower with a little luck can get a bushel from a plot half that size.
He also covers how much grain a family might use for cooking and sprouting in a year:
Wheat, 4 pecks (1 bushel)
Corn, 2 pecks
Popcorn, 2 pecks
Soybeans, 4 pecks
Grain sorghum, 2 pecks
Buckwheat, 1 peck
Oats, 1 peck
Triticale or rye or barley, 1 peck
Navy (or other soup bean), 2 pecks
Alfalfa (for sprouting), 1 or 2 quarts
Lentils, field peas, cane sorghum, ??
This can be expected to take 1/6 of an acre. For all of them. That is, all of the pecks a family could expect to eat (not the one bushel of each kind given before that).
Obviously, families vary in size and tastes. Mine is quite a lot different in the mix used, although probably not much different in total amount. A cup of grain makes about a cup of flour, if someone wanted to figure how much they use by how much whole grain, rolled or cracked grain, and flour they use.
A sixth of an acre for a family is less than 2000 sq ft per person.
I'm pretty old and pretty decrepit and turned that much over with a shovel, breaking the clods and shaking the roots out with my hands starting with sod. 20x50 the first year, that plus an additional 20x25 the second year, ...
You don't have to do it all at once. Do some now for the buckwheat, some over the next couple of months for the winter wheat and rye, some late in the fall to frost seed the plant the spring wheat and oats in, some next spring for the corn, sorghum, barley, and beans.
Besides, you can grow part of what you can eat the first year, more of it the second year. Or just part of it as an end goal - it can still be a help.
Tomatoes and peppers are a good start. You might consider zucchini, chard, and beans as a next step.
Mulch cuts down on the need to hoe.