Amanita
Maester
I don't think that's really possible for such a magic system with influence on almost anything. At least not without adding plenty of information that would slow down the story.A fully developed magic system answers these questions for the reader.
I have to admit that the question if they can create life by turning objects into animals did bother me quite a bit, another thing that can be answered.
If the magic system is more limited by its nature, that's easier. If the magic user can control fire, it's immediatly clear that there are plenty of things he can't do. The specifics of his abilities can be explained while he's learning.
That's the path I've chosen myself. I used to experiment with a magic system which gave influence on almost anything. some call it "high magic" I think, but failed to make it work in a way that satisfied me.
I still like to read them if I'm interested in the story though.
I generally dislike static and predictable magic systems "if I do x spells, I'm going to lose y days of my life" and similar suggestions. Prefer things along the lines of "if you smoke a pack of cigarettes each day, you're more likely to die early, but you may not."