Answer:
In your fire you hear me scream, creaking and whining, yet I am dead before you lay me in your hearth.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
What is as big as you are and yet does not weight anything?
It's been around for millions of years, but is never more than a month old. What is it?
A warrior amongst the flowers, he bears a thrusting sword. He uses it whenever he must, to defend his golden hoard.
People take me on walks and I run and have fun. What am I?