Question 2: Do you do any editing as you go or do you puke it all out (so to speak!) then do all your revision once the draft is done?
Answer 2: Yes. And no. It depends.
Questions like this are tricky and I hesitate to answer them. I suspect that underneath this question is anxiety about the questioner’s writing process. He could be stuck in the middle of a project. Or he has completed a book, but is unhappy with the quality of it. Or he thinks he has a great idea, but is feeling unsure how to build on it.
I know the feeling!
It doesn’t matter how many books I’ve written, I have never written the book I am working on right now. In my experience, each book wants/needs to be written in its own way, much as every child needs to be parented in the way that best suits her, not necessarily what worked for her siblings.
I also understand the desire to ask other writers about their process. I am a voracious reader of auther biographies and particularly like seeing other people’s marked-up manuscripts, like the opening of Charles Dickens Great Expectations.
All that being said, my books generally start with an idea and the voice of a character in my head. I scribble a lot; dialog, scenes, backstory, and often several different directions a story could go. When I get frustrated, I go back and try to figure out which scenes have energy and which ones are useless. I cut out the crap, often restructure what’s left, and fill in where there are plot or character holes. During the cutting and filling I will frequently polish those key scenes until they are pretty much ready to be printed, while others scenes are still incredibly rough (often just a line or two.) Why? Once I understand the emotional state, desires, needs, and weaknesses of my characters in those scenes, I have a clearer sense of how to pace the rest of that story.
But your mileage may vary.