Fresh from the clogged tubes of teh intarwubs…
"… in case it needs saying yet again — this is advice, based on what seems to improve my own writing. I know of no ironclad rules for good writing, other than "Tell the story the most excellent way you can."" Some very useful final-stage editing tips here.
"Whether you want to get an opt-in for your email list, a new blog subscriber, to make a sale, or just inspire readers to support your favorite cause, start with the 1-2-3-4 method. You can add all of your favorite copywriting tricks to make it work even better, but with the 1-2-3-4 elements in place, you’ll have the most important bases covered."