Ideas come from problems or issues happening in and around the organization - must be practical and doable (realistic)
How do we know what those problems are?
Read books and documents
Talk to other people
Do a survey/study
Direct experience - you see them with your own eyes
But you need to talk to your supervisors and mentors too
Is it too big or too small?
Is it doable (lawful)?
Welcome elements of doubts / nothing is 100% certain.
Enjoy doing it!