Second of all, the best advice I can give you right now is to read, read, read. Read as many of these stories as possible. And read critically. Don't just read for enjoyment. Look at how a sentence is constructed, how each plot moves along. Decide what you like and what you don't and then ask why.
Third, understand that a situation is not a story. Taking a character and giving them a scary problem is not necessarily a story. Stories take a lot of careful thought and usually several drafts before they're any good. This means a good story will often take days or weeks to write, not minutes or even hours. If you're not willing to put in that kind of effort, then posting here may not be for you.
As Johnathan said, you really need to have at least a basic handle on grammar before you can start writing, so I suggest looking up some online resources for that.
And if all of this is confusing to you, then you're definitely not ready to write. It doesn't mean you never will be, but you do need a solid foundation and good literary habits if you want to be a strong writer.
I hope this helps. Do stick around and enjoy all of the spooky stuff you'll find here.