Writing a book manuscript
Naturally, it goes without saying that your final draft should be perfect in terms of spelling, grammar, and punctuation. It’s important to show the reader that you are a professional and know what you are doing in regards to the English language.
For the same reason, you also want to make sure you follow the proper format for manuscripts. It’s what editors expect to see, and anything else is a distraction that could hurt your chances of getting read.
It’s also important that your story (if you’re writing fiction) be as good as you think you can make it. Increasingly, editors seem to have less time to help an author polish a work. Instead, they want to see manuscripts that need very little revising.
Also keep in mind that agents and editors have very little time to read manuscripts, since their workdays are consumed with looking after their other authors. So when they get around to yours, they may only have time to read a page or so before rejecting it. For this reason, you want to make sure your first page makes the best impression it can.