My advice is to read the book and take the online courses so you know the framework and the process and then find a really good hackathon that starts with people pitching their ideas. 
Find a person whom you can see yourself working with who has an idea you think is a good start. You knowing the process will be very valuable to that person and team. Over the course of 48 hours, you will likely know if you want to work with some of the people on your team (or maybe on other teams in the hackathon). What is more important than finding an idea is finding a team that is heading in an area that you find interesting. Would refer you to this article http://www.d-eship.com/articles/the-most-overrated-thing-in-entrepreneurship/. 
But you have to get started. As Dharmesh Shah says, the most important thing about doing a startup is right there in the word … start!!!
Good luck and hope this helps.