You need proof of insurance to get the vehicle inspected in Texas and it must pass inspection before it can be titled and registered. Emissions controls vary by county. I would advise you find the inspection station you will take it to, call them and ask what you need to bring.
Finding your station:
http://www.txdps.state.tx.us/rsd/vi/VIactiveStationLocator/default.aspx
Texas vehicle inspection program:
http://www.txdps.state.tx.us/rsd/vi/NewToTexas.htm