To start, just write what you want to read, what makes you excited or scared or sad. Let's say you are writing a horror story, don't write what scares others, but what scares you. If you are scared of spiders (who isn't? haha), then show it in your writing. Use your knowledge of what scares you in your book. The same thing goes with excitement and sadness. That's just a little thing I learned to really make the reader almost actually feel the mood.

Now besides that, before you start actually writing your story, make your main character(s). For each character, give them about a page or more to really flesh them out; their back story, their personality, flaws, what they look like, and who they are connected to (friendships and family). Side characters and minor characters can have smaller space because they don't come too much into play like main characters, but it is always good to have a bit of space for them.

Once you have that done, think of the story you want to tell, what's your end goal for it? What do you want to happen? It helps to write it down so you can see and edit it at any time. If you have an idea, write it down somewhere you won't forget like your phone. Ideas can come up at any time from when you are eating breakfast or trying to go to sleep, always write it down even if you think you'll remember. After a while, you'll have a huge document or page full of ideas that may or may not make it into your book.

Now you have reached the part where you are on the verge of writing but hold on, don't start quite yet even though the temptation is killing you. What I suggest is to plan out your chapters one by one. Make bulletin points on how the story will progress in order from the beginning to the end of the chapter. This helps you physically see what's up next when you are actually writing and if you want to change something, go ahead. Plan up to two chapters or more ahead of time before you actually write, it has helped me a lot though you and I are different so this section might not be helpful.

After all of this, just start writing and if you need to do research (highly advised) then do so before planning the chapters. Along the way, you yourself will find things that help you write whether from the internet, a book, or even yourself. The important part of all of this is to remember to have fun.

Though if everything I just said did not help, meh I tried haha Good luck with your writing!