You can't underestimate the importance of a kickboard, especially when you are just starting your journey. You'll be working on your kick's mechanics, endurance, and strength, so a kickboard will come in handy. It's also an excellent addition for an easy cool-down kick.
There are a lot of options on the market. For beginners, I wouldn't recommend anything branded and pricey. Practically, all the kickboards are the same and get the job done.
My personal preference is a kickboard with holes for hands. That will allow you to rest your hands and fully focus on building that kick!