How to turn an idea into a startup while holding H1b

Hi,

I just started talking to VCs about my business plan, when I realized that my H1b might be a big obstacle. I have H1b from a big corporation.

I have a legal resident co-founder, but I still am not entirely sure of the big problem awaiting me.

How do I go from working for big co. to being able to create and run a startup? Anyone have experience/suggestions?