its a bit difficult to explain detailed steps for multilayer PCB designing through a answer on the forums. We will try to make a tutorial on the same
It's very easy to use and there are a lot of options that you can choose from, such as different types of materials, routing patterns and so on. You can go to my site for writing tips. The software will then show you how your chosen design will look like. I think it is a good idea to design pcb for multilayer.