Once you've you've got an idea for your novel, you need to figure out what is going to happen, and who is going to make it happen (or who it will happen to). These two steps are fluid; they work together to create the overall picture of your novel, and they can happen simultaneously or one by one or in a strange order. It is different for every writer and every project.
This post is for the planner-at-heart. There are 5 different methods here which you can mix, match and customise to work for your project.