Anyone doing Early Texas research? (1820s - 1840s) [View all]

My ggg-grandfather ELLIS of middle Tennessee signed a contract to settle in Texas in 1830. Also signing were his Father-in-law and his wife's aunt and cousin. I don't know if he ever actually went because he is in western Tennessee in 1850. I am trying to make a connection between him and an Ellis family of middle Tennessee that did have several members go to the Fort Worth area of Texas in 1830-1840. Anyone know of any good resources of that era and place?