The questions range from basic information about the professional experience and background of the baker to the more nitty-gritty details of the design of the cake, plus payment and logistics. It’s important to ask as many questions as you can so you can be sure you’ll be happy with the result. You never know when an odd situation might come up like a baker saying they won’t (or can’t) make a certain shape.
If you can, go into your meeting with a baker with some images of what you like and don’t like. This is one area where Pinterest can be a godsend. I wish Pinterest had existed when I got married. We asked our baker for a cake with turned square layers in chocolate fondant and I wanted gold luster powder dusted on top of each layer to look a little warm and glittery. When I asked my baker for that, I said I wanted gold leaf sprinkled on the cake. What I got was something else: actual squares of gold leaf paper plastered a bit haphazardly around all sides of the cake. People walked by it not even realizing it was our wedding cake. I was disappointed but at least it tasted delicious.
There was a breakdown in communication between me and my baker: either I didn’t explain myself clearly or she missed what I was saying. I wish I had had some images, or I wish I’d asked her to sketch it for me, because if she had drawn the squares, I would have immediately caught the problem. If you have any concerns about specific requests, patterns, or materials you want used on your cake, do your best to research the proper terminology of that pattern (Greek Key vs trellis, for example) or material (luster dust powder vs gold leaf sheets) and bring any images or even sketch it yourself so you can be sure the baker understands what you have in mind.