A. Almost never. I start to make it up and have happen what would have to happen as it goes along.
Q. How much should you write a day?
A. The best way is always to stop when you are going good and when you know what will happen next. If you do that every day when you are writing a novel you will never be stuck. That is the most valuable thing I can tell you so try to remember it .... Always stop while you are going good and don't think about it or worry about it until you start to write the next day. That way your subconscious will work on it all the time. If you think about it consciously or worry about it you will kill it and your brain will be tired before you start.