1. Own expertise
First look at your own potential and experiences. Where are my core competencies?
Grab some paper – and brainstorm, brainstorm, brainstorm.
Where are unsolved problems in everyday life? What could be even more ecological, healthier, more efficient - or simply just better?
Which area seems the most interesting to you? Decide and apply this golden formula: "who" wants "what" "for what" (need fulfillment), "because..." (motivation)?
Now it's time to outline - as radical as possible - ideas which provide a potential solution.
Sort your ideas - what is cool and what can actually be implemented?
Develop your idea further, so that it lies in the so-called sweet spot.
8. Now how?
Your business idea is born - now you can think about the implementation.
9. Lean Startup Method
For startups with innovative ideas I recommend the Lean Startup method.
The perfect tool for you is the Lean Canvas.