Assumptions between a designer and client can cost time and money.  When one person assumes glazing framing should be timber and the other aluminum, or one imagines a custom made vanity and the other envisions a ready made on - those misalignments don't surface until selections are already being made.
 
This interior specific questionnaire briefing document walks through the actual finishes decisions your project needs:
Page 1 - General finishes
Page 2 - Kitchen selections
Page 3 - Bathrooms selections
Page 4 - Laundry selections.
 
It's organised by room so you can work through it logically and mark what appeals to you.
 
Give it to your designer before your first meeting. It tells them what you're drawn to, what matters to you, and where your preferences sit. The decisions that follow happen with confidence, without the back-and-forth that kills momentum.