@AnizaElya Use all kinds of writing methods for your own benefit. Write longhand, write on the laptop, write in a notebook, etc. It helps to categorize your story ideas in specific genres: horror, crime, mystery, thriller, etc. I use Evernote for this and I keep my work in Dropbox.
The funny thing is, you never know which is which until you start writing. The story or characters will lead you after some time. You will only then know if it will be a short story, a novel, a movie script, or something else altogether.
Sometimes your story idea can be merged into one as well. So, never throw away any ideas for they will make sense to you some day.
Why don't you join the https://www.facebook.com/malaysianwriterssociety/
You may find it useful.
Feel free to write to me if you have anymore questions.