Lots of good info.
What is the biggest town in Bell county?

It will be hard to give accurate information on soils because the very so much, But a good start is the other ponds around you,If they hold water good that is a good sign.

You should dig a few test holes before you get to far along just to be sure .

You can dig a pond with a shovel and put the dirt in your pocket if that is all you have.

When you are building it your self use what you have and have some fun.