In addition, in order to work out new ideas and create the right business plan, you can read various articles and take a lot of useful information from there. For example, recently, I came across a very good article on this topic: https://www.eleken.co/blog-posts/saas-business-model-learn-h...
Agree that you should have knowledge of one or two ways make money from your idea, i.e. the "business model". This goes into criteria 4 of the "Must haves", where you basically need to work out how much profit you'll be making.