Editing your Manuscript
Editing and revising is where your writing really comes into its own. It is the most important step to learn if you want to write professional quality fiction.

There are a couple of books I can recommend. First is Self-Editing for Fiction Writers. Next is Strunk and White's Elements of Style.

It is important to remember that you are not just writing to please yourself, but also to grab the attention of an editor or agent. As such, spelling, grammar and punctuation are absolutely essential if you wish to be taken seriously as a writer. But don't fear, there are lots of excellent spell checkers out there and workshops like the Online Writers Workshop or Critters can really help you home in on your weaknesses so you can work on them.

Most people prefer to print out a copy of their rough draft to work on and this is how I work as well. The reason to get away from the computer is to quell the urge to fiddle endlessly with things. If you have a hard copy it is easier to mark what isn't working and keep going. The next step for me is to go through the rough regions of the text and fix all the little problems I noted on the hard copy. This is the stage where any glaring plot holes need to be fixed as well.

Now, at this point, you should have a pretty serviceable story. I like to run it through the OWW again and maybe do some reading in the style and mood I want for the piece and then do another pass just refining things and smoothing out the rough spots.