Sim Traits: Creative
Items Needed: Desk, Very Comfy Chair, 1 Unbreakable Computer or 2 computers
Practice Writing, do not bother writing books unless needed for the Aspiration. Until you hit level 10 writing you won't write Best Sellers and even then its random.
Tips I'd suggest
-Any perks that lower needs (Steel Bladder) for instance
-Buy 3 Writing Books from the shelf and have your sim read those as you go for maximum efficiency
-Having a second sim that cooks and cleans will lower the time your Sim needs to be bothered
-Enable emotional auras on FOCUSED items and stack it around the canvas