Overall guide: https://www.nolo.com/legal-encyclopedia/forming-nonprofit-corporation-texas-36089.html
Steps:
FIRST: File the form thingy and become a State of Texas nonprofit
Form: https://www.sos.state.tx.us/corp/forms/202_boc.pdf
But must include valid IRS language
THE FULL MONTY: https://www.irs.gov/pub/irs-pdf/p557.pdf
Advice: https://www.sharinglaw.net/npo/501c3.htm (but for Connecticut)
Also write bylaws (should be easy??…)
Texas documents: https://www.sos.state.tx.us/corp/nonprofit_org.shtml
SECOND: File the 1023-EZ
More on that: http://www.irs.gov/uac/About-Form-1023EZ
THIRD: File to get tax exemption with the State Comptroller
????
NON-PROFIT!