Starting stories with a general idea about a problem and no targets is a great way of getting a robust and healthy plot line going. The reason I say that is that I have carefully studied how Joe Neilson (the unrecognized co-founder of TPRS along with Blaine Ray) used to start his stories. I’ve interviewed him on it.
Joe told me he thinks of a general problem that some character has, and that just doing that is enough to get a good story going.
So, what you do is think of an interesting character, like we do when we create characters in the Create phase of the star, but then you do one more thing – you think of some desire or fear that reflects the personality or physical form of the character.