I'm a picky eater and I manage very well. If you love chicken, Quorn brand
is probably the best substitute you'll find (check site for places that sell it). The chick'n nuggets cooked in the oven are amazing and the unbreaded chik'n tenders are PERFECT for cooking with. My meat eating family loves them. They're soy free too.
Honestly, I don't like peppers or brussel sprouts either. I can only eat onion that's been cooked (hate raw) and eggplant in the parmesan recipe. Collard Greens have to be cooked a certain way too. I was honestly a lot more picky when I was a meat eater, I would never try half of the vegetables I eat today, I didn't know what I was missing.
I'm honestly so glad to hear that you're trying to make a change, it will be a benefit to you both short and long term. It's great to hear that you want your kids to be healthy. I used to work at a restaurant and people used to let their kids eat stuff I would NEVER put in my own mouth, let alone my child. They would feed them chicken fingers, fries, and soda, then wonder why their kids were so active and grumpy. I noticed a HUGE difference in the behavior of the kids who got the healthier options (PB&J, fruit, and water). Seriously, like night and day. Think about all the toxins in meat too, hormones, antibiotics, cholesterol, high amounts of calories and saturated fat... and that's just in the chicken, not the breading/toppings/rest of dish. I used to live off chicken fingers in my meat eating days (with fries and BBQ sauce). No wonder I was so tired all the time and carrying around an extra 8 pounds.
My sister did the vegetarian thing for a while, her hubby is a Meat and Potatoes guy. It was a battle for a while, but he actually changed his diet a bit, started eating healthier. When my sister took her 2 year old to visit her Hubbys family, she noticed a HUGE change in his behavior when he ate the food they served (they even put SODA in his sippy cup, she does not allow that). He was a totally different kid, so grumpy. She's not a vegetarian anymore, but she said she'd like to do it again