Question
We just built a new house in a new subdivision that was in the middle of a Byhalia grass pasture.  What is the best way to get rid of the Byhalia grass and get a good stand of Centipede started.  We are located in south Mississippi on an acre of grass.

Answer
Bahia grass should be fairly easy to control, though it may take some time.  In the pasture, it has, probably, gone to seed for many years, leaving seed which will sprout for some years.
The basic process is three steps:  eradicate bahia, tend lawn soil, plant centipede.
Fortunately, bahia does not like close mowing and centipede does.  This will be the practice which will, eventually, create a nice centipede lawn.
References to Cimarron, Roundup Ultra, and Plateau  herbicides are made for eradicating the bahia.  There is a caution about seeds which will come up in the new lawn.  Ask local ag agent for advice on which one to use.  There are resistances built up by bahia.
After herbicide, a cover crop such as millet in summer and a grain in the winter, plowed down, will reduce residual seed issues.  If you have the time, take the extra growing season to get rid of bahia, or be prepared to heavily favor the culture of centipede with exactly timed herbicide applications, fertilization and mowing practices.
Be sure to read Art Bruneau's article on Centipede care:
http://www.turffiles.ncsu.edu/pubs/management/ag-381.pdf
He is a top turf specialist at NC State University and outlines the specific care to grow a good Centipede lawn.
Best of luck.