The best practice of Article / Web 2.0 / Blog submission in off-page SEO?


I am planning for my e-commerce new project. And I am stuck at the best practices of off-page submission for Articles / Web 2.0 / Blogs. I have some questions in my mind which are as follows:

  1. Can I submit the same Article / Post (or content) in different off-page submission sites?
  2. How can I measure that which off-page submission sites are important or useful (like any terms DA, PA or DR).
  3. And How much content submission will effect my domain progress or good link equity?