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first test rounds on a web page or conversion funnel start with A/B/n testing of the major elements (such as value-proposition emphasis, page layout, copy length, and eyeflow manipulation).
Chris Goward • You Should Test That: Conversion Optimization for More Leads, Sales and Profit or The Art and Science of Optimized Marketing
Chapter 10 Your Content Roadmap: Constructing A “Sticky Web” For Your Writing
Nicolas Cole • The Art and Business of Online Writing: How to Beat the Game of Capturing and Keeping Attention
AIDA (Awareness–Interest–Desire–Action) or Ehrenberg’s ATR (Awareness–Trial–Repeat).
Jenni Romaniuk • Better Brand Health eBook

For example, if you wanted to “beat me” at the game of online writing, and acquire all the achievements I’ve acquired, all you would need to do is: Publish something new every single day (because I publish something new every single day). Write fast-paced articles that use short paragraphs, declarative language, and subheads for every main point.
... See moreNicolas Cole • The Art and Business of Online Writing: How to Beat the Game of Capturing and Keeping Attention
Test different headlines, early paragraphs, and primary imagery.
Ben Hunt • Convert!: Designing Web Sites to Increase Traffic and Conversion
‘Most good copywriters’, says William Maynard of the Bates agency, ‘fall into two categories. Poets. And killers. Poets see an ad as an end. Killers as a means to an end.’ If you are both killer and poet, you get rich.