If I need an app

If I need an app for my business but I don't know anything about app development, what should I start with?

At first, you'd better tell what your business is about, what kind of app you need and so on. At this moment, the question is too general

Those are fair comments, but still, even with such little information, I would advise you to seek help from professional developers and at least consult with them. You can start with https://binary-studio.com/desktop-ap...n-development/. I had a positive experience with them: they made several applications for me. If the conditions are satisfactory, then try it.