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These are great sources of income. Constant Content has very high standards, though. Paid Forum Posting is a bit low-paying, and Fiverr or Textborker can pull you in a halfway decent amount of cash. Where ever you go online to look for work, make sure you make enough per hour to make it worth your while.
Yup, but be it creating your own product or selling someone else's product, it is important to take note that if you do not start doing any form of marketing, no one will ever realise that you are actually selling something. This is why amazon is so successful, because people go there to get stuff, the market themselves well. So just start somewhere, start anywhere, the important thing is to start. Stop sitting on all that information that you currently possess. take the first step and be amazed at the results it brings to you.