I have not been good at sticking with the Heinlein rules on writing (and am not particularly a fan of Heinlein), but I nevertheless believe they're a good set of guidelines for burgeoning #writers to keep in mind.
• You must write.
• You must finish what you start.
• You must refrain from rewriting.
• You must put it on the market.
• You must keep it on the market until sold.