CWL differ from state to state, in Texas you must be over 18, valid Texas drivers licence and sign up for a course that is 8 hours long. Write a 25 question T/F test, and pass a "proficiency" practical. Which is a joke, you need 175 out of 250 points at 7 feet. Basically in 40 rounds, 30 have to hit the large paper target in front of you. Doesn't really demonstrate proficiency to me? plus you can take the practical up to 3 times if you fail!!!
I think only 18 states issue CWL's and not all of them are reciprical, so once from Texas works in OK, AL but doesn't in OH.
The other states I am not sure about, but in general, its sort of a joke, there is no licencing for firearms down here (I am in Texas for 3 months), anyone can buy anything that isn't prohibited.