Well, I suppose it depends on what kind of writing you're looking to do. If you're into the fantasy genre, you could do a more tried and true type of story: the usual hero saving the kingdom type of story. Take the usual setup, good guy vs. the big bad and make it your own.
Hero is sent on a noble quest to defeat an evil monster that raises the dead and attacks the small villages. You could create your character and develop his concept twice: the main concept which is how you see the hero at a given point and the secondary concept, which could be how the hero starts in the beginning or how the hero changes in the end. This will give you an idea for how to direct character growth throughout the story.
After traversing the perilous lands and defeating countless foes, the hero squares off against the evil monster, triumphing and saving the princess. True love blossoms and when you return to the king, he grants you her hand in marriage. You live peacefully, having a son with your new wife.
Then you go edgelord as fuck.
The powerful demon wizard whom the monster served returns to find his plans have been delayed. Seeking revenge, it binds the aging king's soul in a pact in exchange for immortality, corrupting him in the process. The king summons you to his castle, while the demon slips into your home while your wife sleeps. Whispering madness into her ear, he shatters her mind, convincing her that the baby is a cursed hellspawn that will destroy her new husband. In her delirium, the demon compels her to cannibalize the infant and mid-chew, releases his control. With the few fragments of her sanity now fully destroyed, she plans to reunite your family in the underworld, preparing a poisoned meal for your return.
Meanwhile at the castle, the king draws the sword gifted to him by his new master and attacks you. The demon's treachery goes further, however, as the sword turns out to be cursed, turning on its wielder, slaying the king as the guards witness your fight. Now wanted for the murder of the king, you flee from the castle, and return home to warn your wife.
You return home to find your wife waiting, eager smile on her face. As you eat, your wife faints, succumbing to the poisoned stew. You feel queasy as you rush to her aid, the sub-lethal dose of poison only starting to take effect. As your wife dies in your arms, she says now you can all be a part of each other. You see the unusual carcass butchered in the kitchen is in fact your son, causing you to vomit violently as you hear shouts from outside. A crowd of villagers led by the king's guard have followed you and set your home on fire. Unable to escape the mob, you are dragged and summarily hanged as you watch everything you have worked for, your home, your wife, your son, burn to ashes.
You know, something pretty straightforward.