Here's a reference to Texas wheat yield bushels per acre. I'm guessing from the amounts these are non-irrigated fields:
http://www.nass.usda.gov/Statistics_by_State/Texas/Charts_&_Maps/zwhea_y.htm
A bushel of wheat weighs 60 lbs
http://www.unc.edu/~rowlett/units/scales/bushels.html
This reference says it takes 1 lb of grain to make one loaf of bread
http://livingprepared.blogspot.com/2010/04/how-much-wheat-to-store.html
So with a little math you should be able to figure out how much wheat you want to produce, and approximately how much land it will take. I would personally use a low yield from the Texas yield reference page to start with, maybe a convenient low number like 25 bushels per acre, then you can multiply that by 60 to get pounds per acre, 1500 lbs. or 150 pounds per 1/10 acre which looks like it would be enough for almost three loaves of bread per week.
I would strongly suggest growing the wheat in a fenced area, to keep out the varmints. When I tried to grow wheat, the squirrels ate it just as the heads were getting nice and plump.

And we have so many deer here anything tasty out in a field just get mowed down unless you have acres of it....