As long as you have a general idea for the plot line, then you’re good! I do a lot of free thinking as I code my stories, and having a general outline certainly helps if I get stuck or have writers block.
My story is My Secret Profession. This story didn’t have a set ending until I was almost done writing. It’s a good example of having a general idea, and letting your thoughts come naturally as you write 
I hope you enjoy if you decide to read 