Logos need to go through rounds of refining before they’re ready because, in theory, once your logo is decided you can’t change it without a massive overhaul which can affect your branding strategy. A logo is the face of your company, if people start to see a different face, they will start to doubt how legitimate or organized your business is.
All of this information can be conveyed via a meeting, or in a design brief. Preparing this information and compiling it will save you time and frustration with your designer, and they will definitely appreciate the thought you’ve put into it. Afterall, your logo is the start of your branding strategy.