Ready to jump, how do I?

I am completely burnt out working in big companies. I've been trying to get on with a startup here in San Francisco for the last couple of weeks but have had zero success. I'm getting to the point where if nothing changes in a week, I will throw everything I am into trying to build and launch a product I have had in mind for months.

I'm scared though. I only have enough personal runway for about 4 months. I don't have contacts with any VC/angel type people. I don't know anyone who can advise me on the crucial aspects of forming a company in California or anything dealing with the IRS. Where do I start? Am I just crazy even though I'm unhappy?