Getting started here

I have been going on this website for years, but just now got an account. Never felt like I needed one because I never wrote anything or had any ideas. Now I do. Made and account and started writing. I have felt like I have gotten better because of this website. The first chapter of my first story One in a Thousand had a very shitty everything. It serves no purpose to the story and I even am considering removing it because it's to long (who wants a 30 minute long story with only 5 min sex scene) and is terribly written. I have felt like my second chapter has been more professional written compared to the first one. Anyway, I plan on making way more stories, (Like 20 stories or something) but I am going to do one at a time. I also need ideas first. I hadn't though of how I was going to make the ending of the story I had already started to write. Big mistake. I tried to delay it by adding unnecessary parts which just make the story worse.

Protip: Plan out the entire story before you start writing it. What is the ending about and how is it going to go down? Where are you starting the story, the same day or a month before it happens. When you have the ENTIRE story finished in your head, start writing it.