I'm a pantser through-and-through for NaNo, so I'd like to say, when it comes to planning:

1. You don't have to

2. If you have a vague idea that's cool

3. If you don't that's slightly insane but so much fun

4. Don't forget to have water and food nearby for when you get "in the zone"

5. Know the basics of your characters, you can learn more about them as you go through, but you need to at least have a name

6. Don't let planners make you feel unprepared, pantsing is awesome and not to be knocked for it is not for the faint of heart