A few questions that will help to understand your vision. 
1. Can you give me a general idea of the style and tone of the game?
2. Do you have a rough gameplay footage or a demo of the game that I can have a look at?
3. What's the deadline for the project?
4. Are there any similar soundtracks you would like me to use as reference? (Optional)
Let's create something amazing together! 
Thank you!