Here are the 18 Rules for writing by Mr Samual Clemmens (Mark twain).
1) That a tale shall accomplish something and arrive somewhere.
2) They require that the episodes of a tale shall be necessary parts of the tale, and shall help develop it.
3) They require that the persinages in a tale shall be alive, except in the case of corpses, and that the reader shall be able to tell the corpses from the others.
4) They require that the personages in a tale, both dead and alive, shall exhibit a sufficient excuse for being there.
5) They require that when the personages of a tale deal in conversation, the talk shall sound like human tlk, and be talk such as human beings would be likely to talk in the given circumstances, and have a disciverable meaning, also a discoverable purpose, and a show of relevancy, and remain in the neighborhood of the subject in hand, and be interesting to the reader, and help out the tail, and stop when the people cannot think of anything more to say.
6) They require that when the author describes the character of a personage in his tale, the conduct and conversation of that peronage shall justify said description.
7) The require that when a personage talks like an illustrated, gilt-edged, tree-calf, hand-tooled, seven-dollar Friendship's Offering in the beginning of a paragraph, he shall not talk like a negro minstrel at the end of it.
8)They require that crass stupidities shall not be played upon the reader by either the author or the people in the tale.
9) They require that the personages of a tale shall confine themselves to possibilities and let miracles alone; or, if they confine a miracel, the author must so plausably set it forth as to make it look possible and reasonable.
10) They require that the author shall make the reader feel a deep interest in the persinages of his tale and their fate; and that he shall make the reader love the good people in the tale and hate the bad ones.
11) They require that the characters in the tale be so clearly defined that the reader can tell beforehand what each will do in a given emergency.
An author should
12) say what he is proposing to say, not merely come near it.
13) Use the right word, not its second cousin.
14)Eschew surplusage.
15) Not omit necessary details.
16) Avoid slovenliness of form.
17) Use good grammer.
18) Employ a simple, strightforward style.