Read the 7 books by copyhackers, other than that here's some tips:
1. Title should address problem
2. Subheader to title should present solution.
3. Make a customer avatar to understand your reader
4. Add pictures, at least 1 per 500 words
5. Add subheaders, 1 per 350-500 words
6. Use bullets
7. Use numbers in headers and subheaders
8. Appeal to 1 of 7 vices
9. Optimize towards keywords or keyword topics
10. Place keywords in first & last paragraphs, title, and one header