Step 1) Take and pass the USCCA CFI Course, successfully.

Step 2) Apply with TXDPS, pay the fee and fill out a form LTC90. 

Form 90

Step 3) Apply for Fingerprints, use code 119Q91


Step 4) Turn in fingerprints receipt, USCCA CFI Cert, Form LTC90, and if you have your LTC send in a copy of it along with your DD214 if you are military.