To plot or not to plot, that is the question.
Not really. You need a plot.
What is a plot you ask?
Nathan Bransford does a good job giving a brief explanation. Do You Have a Plot?
and then there’s this,
Need to know if you’re overdoing your plotting?
Janice Hardy’s Fiction University is a wealth of helpful tips such as Too Much of a Good Thing: Over Plotting Your Novel
There are many methods you can utilize to help you plot.
Joanna Penn’s Mindmapping
Sara Toole Miller’s Mindmapping