[kids game] Ideas for dragons

[khorboth]

I'm having a hard time coming up with good ideas for dragons in a homebrew world. I'm running it for my kids, 6 & 8. High-fluff, low-crunch.

My 6-year-old wants to be a dragon-trainer. Fine. I'm looking to put dragons center-stage. But then... I'm kinda overwhelmed with choice. How should I design dragons?

She loves the extended universe of How to Train Your Dragon on Netflix, but I just can't deal with that level of terrible worldbuilding. I just can't.

So, I'm looking to put them in a mountainous, resource-rich kingdom which has maintained peace with their neighbors because only this one kingdom knows how to train dragons. I'm then going to build drama about egg-stealing and secret-stealing, and maybe all the dragons leaving and having to be called back.

So, my biggest questions, I guess, are: How much variety should I have in dragons? How many dragons should I have? Why can only this one kingdom train them? (I'm thinking it's some magical talent in the royal line) What is the mechanism of training?

What are your thoughts, great crowd to whom I'm sourcing?