The most important thing is to read as much as you can, like I did. It will give you an understanding of what makes good writing and it will enlarge your vocabulary.
J. K. RowlingWhat she did have were Bertie Bott's Every Flavor Beans, Drooble's Best Blowing Gum, Chocolate Frogs, Pumpkin Pasties, Cauldron Cakes, Licorice Wands, and a number of other strange things Harry had never seen in his life.
J. K. RowlingYou thought I would not weesh to marry him? Or per'aps you hoped?" said Fleur, her nostrils flaring. "What do I care how he looks? I am good-looking enough for both of us, I theenk! All these scars show is zat my husband is brave! And I shall do zat!" she added fiercely, pushing Mrs. Weasley aside and snatching the ointment from her.
J. K. Rowling