Let your fingers lead the way...
Ever sit in front of the keyboard with nary a thought as to what to write?
Do you have questions about your own characters and their potential high jinx?
No need to ruminate over what to do next. Just place your fingers on the keys and see where they, along with your imagination, lead you.
I've had characters change professions, personalities, and even genders when I let go of the reins and allowed the story to lead me -- always with far better and more interesting outcomes than what I'd originally planned.
So enjoy not knowing where you're going. It's definitely half the fun, if not more!