Heinlein's Rules On Writing

The late Robert A Heinlein had 5 rules for writing:

1.) You must write.

     This is true, you can't get published without writing something.

2.) You must finish what you write.
     You will never get published if you never finish what you start.

3.) You must refrain from rewriting, except to editorial order.

     Now this one, I don't necessarily agree with, Tolkien rewrote the beginning few chapters
     of the Fellowship of the ring 3 times before he settled on the 4th version.

4.) You must put the work on the market.

      Unless you don't want to get published, it has to go to market.

5.) You must keep the work on the market until it is sold.

      Again, true, keep selling.

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King's rules: 

1) Start the next story. Especially while waiting edit approvals. If your book bursts into orbit, you may be asked for another, be ready.
2) Don't get discouraged, keep at it!

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There are all kinds of variations of these rules out there, look around, go to writer's conferences (if you are able) and join critique groups (or start a critique group, Tolkien and Lewis had the Inklings, what do you have?)