I don't want to work for a company, I'd much rather start my own. And there are definitely some problems I'd like to solve, but I'm still figuring out which ones will actually add value and how to go about solving them. Any advice? If I just applied with a bunch of ideas and the YC team liked one, would it be considered? I'd imagine there needs to be at least some progress but still thought I'd ask.

My relevant background is that I built a social calendaring app with my college roommate and it was eventually acquired by our university. In my eyes, it was a failure that I learned a lot from.