Good for you for figuring this out! Speech Language Pathologists are also trained in this area. The best book I've read is "Just Take a Bite" which is very parent-friendly, and also has exploration options in the back. My youngest began food therapy at 18 months. He is now 4, and hands-down the best eater of all my children (others are ages 8, 13, & 15). I wish I had known there was help available with the first three. (FYI--I respectfully disagree with Lola's post). There is a difference between a picky eater and a resistant eater. Resistant eaters need intervention. I do agree with the post about talking to the school. I'm doubting he will qualify for service through school, but at least ask so you can see if you can get any help for free. As far as how often appointments are, it depends on the severity & how much you work at home. We did therapy 2 x per week the first 2 months, then once monthly for a couple months. We absolutely practiced the strengthening exercises and introduction of textures. It's not a quick process, but there's no point meeting weekly while the child is learning and moving to the next level. Hope this helps!