TexasCHLforum.com

You will not have to fill out the application again. You will receive a packet with a hard copy of the application you did online, and instructions to correct any mistakes or ommissions there. You will also get 2 fingerprint cards, 3 affidavits that must be notarized, a passport photo holder, instructions, and a CHL handbook.

You can apply online and take the class before the packet arrives. Just remember that the application your instructor gives you will have a red number on it which would be your CHL number had you not applied online. Just trash that and instead include the hard copy DPS will send you from your online application when you mail your final stuff into Austin.