What questions should beginners ask developers first?

I am currently learning about digital products and thinking about building a simple app idea in the future. While researching online, I noticed many companies describing themselves as an App development Company, but it can be difficult to understand which one is the right fit. Since I do not have experience in this field yet, I would love to hear suggestions from people here. What are the most important questions someone should ask a development team before starting an app project?