There is a large module in the Reliable Income Academy that specifically addresses product selection.
We have also developed a 21-point Product Selection Checklist, this is a great starting point.
Once your product meets many of the criteria on our Checklist we have a research process for you to follow. This is where you collect specific data from other listings on Amazon to establish that there is an opportunity for your product there.
We also recommend Reliable Income students form or join a mastermind group with other students so they can discuss granular detail such as which product sample do they like better etc.
Students should do this only once they have thoroughly completed all the Reliable Income Academy modules so they can contribute equally to their fellow mastermind members. Masterminds have proven instrumental in accelerating student results.