Exodus 3

Todays reading was the first half of the burning bush story. God speaks to Moses out of a fire that is burning in the midst of a bush, but which does not consume it. That gets Moses' attention, and Gid then sends him on a mission to free the Israelites in Egypt. Most folks know the story, and it has been featured in many movie and TV accounts of the story of Moses, but still I wonder a few things:

What does God sound like? The voice here was clearly an audible thing, not just God speaking to Moses in his heart, and so I wonder what He sounds like.

Would the fire have burned Moses if he put his hand into it? I mean, was it just the appearance of a fire that God was using to get Moses' attention, or was it a real fire and God was miraculously keeping the bush from being burned up?

What would have happened if Moses just kept walking. The text says that Moses saw the bush and turned aside to investigate, and at that point God used the opportunity to speak to him. Had Moses been like 'eh, whatever' and kept on going, what other miraculous sign might God have used to get his attention?