My five cents here:
Read a lot, figure out what you like. Think what kind of story you would want to read. Write it. Get in touch with people here, find a team to work with, beta is useful even in the early stages to bounce back ideas.
Maybe write some short writing prompts we have here in GA and see what kind of "author voice" you have. When you start your story, think about the beginning and the end, and what happens in the middle. Fall in love with your characters, even with the darkest ones. You gotta care for them to make reader care for them.
Enjoy the process, have faith in your story. If you don't FEEL it has to be told, then it probably wont entertain readers either.
Panic all you want, but remember it is supposed to be fun!
I started writing a little over a year ago and I'm totally addicted. I try out new things and test my boundaries. One of the best moments of last year was to complete my very first story, it turned out a bit over 70k words and it still has a special place in my heart. I didn't expect it to be perfect, but I did spend much time working on it.
Happy writing