My first thoughts, beyond what everyone else has already offered:
Build the pond to fit the site. If the site dictates a three acre pond, build a three acre pond. If it suggests a smaller one, build it to the proper size. Determine that primarily by the size of the watershed. In Kaufman County, expect to receive 35-40 inches of rain yearly in a normal (whatever that means nowadays) year. A safe estimate is that it will take 7-10 acres of watershed to support one acre of pond. If you have 40 acres of watershed, you'll need a five acre lake. If you have 15 acres of runoff, an acre pond, maybe two. If the watershed is 100 acres... you get the gist. If the pond needs to be bigger than your budget, wait until the budget grows.
As you do your due diligence, definitely buy "Perfect Pond..." That book will take you through much of what you need to do to make good decisions.
Long term success will be determined by the habitat you build. If you build excellent habitat for all size classes of each species of fish, you'll have a successful pond. If you don't offer great habitat, your pond will become what it is destined to be by the fourth or fifth year. You won't want to "money-whip" it to be something it can't be.
With great habitat, manage your food chain. Diversity is good in nature and that applies to the food chain. As you make your plan, include fish that spawn prolifically and can reach the sizes of your dominant size classes of fish as they grow.
One thing I will reiterate from the voices above, if you bring adult bass from another lake to yours, don't expect them to thrive as they did in the one where they grew up. A pretty high percentage will decline as they just won't be able to re-condition from what was a great environment for them to a new environment. Fish are conditioned to their environment. Since they don't have the ability to think, they have a hard time trying to make it in water with different chemistry, and clarity, as well as different ambush points, plant life and ecology.
You mentioned "Flood Plain". Be sure you won't need any permits. If you plan to build in a delineated flood plain, there may be some restrictions...not to mentioned a watershed too large for a small pond.
