1. I assume it wouldn't matter. I would probably get the newest one because it would have the revisions in it.
2. There was a long discussion on this. Most people do not wash jelly rolls, some put them inside a bag like a lingere bag and washed them. I don't wash mine.
3. There was also a discussion on this. When I measure I put the line on top of the edge of fabric. I try not to go left or right.
4. There are also discussions on this. Many people now press seams open, I still press to one side unless it has a lot of seams like a Stack n Whack or a Mariner's Compass.
Have a great day! If you put what you looking for in search you will find many posts on the subjects.