Kanban systems can be confusing until you see them in action. If you are unfamiliar with them, try to find a local company that uses them, and arrange a tour. Many companies are willing to work with other local businesses to share best practices.
When you have a good idea of what a common process is supposed to look like, try to implement one of your own. Start out by trying to make a few cards in a single area and work out the kinks in your processes. Once you gain a better understanding and learn a little more how you want to run things in your own organization, it is time to stabilize the processes and start rolling them out in other work areas. I want to stress that point: document your processes and follow them! If you don’t you’ll end up with several different kanban processes that won’t play nice together.