Hi! First of all, thank you!! Hopefully I'll be able to get my revisions out soon so you can read some more!
My best piece of advice is to plan out your story on paper (or Google Docs XD) before you start writing. Develop your characters, your plot, the number of chapters you want, etc. Then you can start writing. It really helps me to know where the story is going so I can tie it all together. Good luck!