All writers belong to a club. The plotters, the pantsers, and, as Fallon DeMornay call it, the Pantyliners! Some of us need to plot every aspect of our stories, using charts, story boards, or whatever means work for us. Others just sit at the computer and let the world pour forth. And then, there is a place somewhere in between.
None are right, and none are wrong. There isn't one that is better than the other, or more likely to lead to success. It is all about finding what works for you, and will help you tell your story.
These writers like organization. They like rules, structure and control. I am definitely a plotter, and find that by planning ahead, I can catch plot holes or conflicts in my story before I get too far into the tale, and write myself into a corner.
Plotters use outlines to plan their stories, whether it is through a story board, or on their computer. For me, I write the blurb for the tale (a short summary that gives the GMCs and main aspects in a paragraph or two) then break the story down chapter by chapter. Here, I can see at a glance the character development, plot arc, and any issues that may arise before I write them in full.
Some plotters use index cards where they breakdown the plot, characters and development. All this is done before you place a single word on the pages of your manuscript. A lot of the work is done upfront. This may cost you in time if you are on a deadline, or if you spend too much time on the plot, and never get to actually writing the story itself.
Free spirit, fly by the seat of your pants, and let the wind take you where it will are descriptors of a pantser. There are benefits to pantsing, as you just go with the flow and allow for the natural progression, but it could cause you to miss key elements of a story, or drag your pacing.
Let the words flow, and get on the page. If you are a pantser, it is all about that first draft, and the 'rules' will come later during the editing phase.
For those that fall somewhere in between pantsing and plotting, you are a pantyliner. I am definitely in this group, as I do outline my stories, but when it comes to writing, I follow a natural flow and let the characters dictate. Since I have an outline, it is fluid document that can change as the story itself changes. Like I said, you can catch issues as you move through the story. If you have an ending in mind, one that you want to make sure you reach, you can adapt the chapters as needed through this process.
You probably have an opening, ending or certain scenes in your mind, but everything in between just happens. Your story arc and character development remains at the forefront, but isn't as stringent as with hardcore plotters.