Your question is Starting a Vague Design Project. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you were given a loosely defined design problem and had to lead the initial discovery phase. How did you figure out what to learn first, align stakeholders, and turn ambiguity into a clear design direction?