Otherwise everyone has their own projects.
No one will read what you wrote above and think "Wow, he sounds like a good leader with a solid plan."
I could go on and on with suggestions.
> It's a specific topic and I don't want to bother my friends with it, I need someone who will be 100% interested in it.
These two things are mutually exclusive. The kinds of people who you want to work with tend to have ideas of their own, or a multitude of other offers to choose from.
Since your job is to get people excited enough about your idea to build it for free, you need to have some good sales skills. And, if you want to keep them engaged and productive, you'll need to be an amazing leader.
If you pull this off, I suspect that you'll learn as much about leadership as you do about code. Good luck!!