You cannot just pick up the pen and expect to get it right the first time. You must first learn the craft. According to some estimates, it takes ten to fifteen years for most writers to become published. That is longer than it takes medical students to become doctors. Join a critique group.
Critique groups allow writers to rub adjectives with fellow enthusiasts of the written word.
They range in size from a few to a few hundred, and they come in as many flavors as ice cream. There are groups for romance writing, horror, mystery, children's, literary, and mainstream. I belong to the Science Fiction Writers Workshop, which critiques both science fiction and fantasy stories. There are also many groups that have no restrictions on genre. To get in you merely have to be willing to write critiques.