Well for starters, as much as I'm sure this is going to annoy you- practise. When I started writing it was all nonsense and I didn't get any reads and- they story lines were terrible. What i would say is - don't write a story for the sake of writing a story. I've always written but these days I crave to write when I'm stressed.
Make sure you feel for your characters, try out some drafts and find a character and story line that you fall in love with- the first draft of pet angel she wasn't even an angel!
Also, make sure that you enjoy what your writing, I honestly laugh at the jokes I make more than any one reading it will, because it suits what I enjoy to write. Don't write for other people, write for yourself x