I'm not a super-detailed planner, but I basically need to have an idea of the important points along the way, and enough notes about the important characters that I know where to start with them. I find things out along the way and then change the plan, but if I don't have the plan to start with, I get stuck after a while.

I hear you on having many WIPs, though!

615 is a nice word count for a day, congrats!