Ah, great news! I'm really happy for you to make this life-changing decision! Let us know once your website is up, I'm curious what your business is all about, I have some contacts that might be interested too :)

Also regarding people thinking you are a fraud, check out this link. There is actually a very common syndrome that is exactly that. I had it in the past when I started a new job or position which I thought was way above my abilities. After a while, you will realize you can do the job. And when that happens, I see it as a time to move on to the next challenge :) To learn something every day!

Keep us posted!