I've modeled most of my life and my 15 yr old has modeled. My 15 yr old spent a week in LA (with me as chaperone) modeling and she said "mom, I just don't like this". We finished the weekly obligation, chalked it up to a good experience and never looked back. For me, I grew up in a rural area, loved the travel and since moving to DFW area have had nice experiences.
First....IT IS WORK, it is not easy money. Second.....YOU spend NO $$$
If an agency or whatever ask you for money....RUN don't walk away.
Reputable agencies in the DFW area are Kim Dawson and Campbell to name a couple.
If they are interested in you they will call you.
Again, are you doing this for you or your child? It is work. You are called to audition and expected to be there... It might be nap time, snack time, etc and if your child does not like it STOP
If your child thrives with it......PLEASE put the money your child makes into a fund for your child. We've seen parents pocket the money the children make and that is SO unfair.
Be ready for cut throat brutal comments. You have to be able to take it and let it go. One of my daughter's friends got cut from her Dawson contract because he teeth got crooked and she had to get braces. It has a lot of positive things about it and a LOT of negative. The main thing is to not let your child get a negative complex about him/herself due to the comments that are made in front of them.
Good luck