For changing skills, you can take a look at Baardvark's Skill creation page. It's got a listing for what the different entries in the skill do.

There's also a page about animations that may be useful for you if you'll be working with animations: https://docs.larian.game/Animation_resource_panel

The main attributes are on a scale of 1-10 for their current level (we call these 'levelmapped'), because we'd want a level 1 dragon to have lower attributes than e.g. a level 10 dragon, and that one to have lower attributes than a level 20 one, etc.
The engine's internal balancing logic determines the exact value for e.g. "a very high Str for level 7".