Ask HN: Starting a company on H1b visa?

I am currently working on H1b with a company in bay area. I have an idea for a startup which I want to pursue. I have read many articles online that on H1b visa I cannot work on building my app after my 9-5 job and it is illegal to pursue something like that.

I also read few articles(old postings in HN) where people have registered a company on H1b and transferred their existing H1b for that newly created company(with a board that has the ability to fire you).

1) Considering all these different options, how viable is to start a company while being on H1b visa and build my app which I can pitch to investors?

2) how much capital is required for creating and registering a company?

3) Do I need a Greencard holder or citizen as a co-founder? Is it required for the co-founder to invest as well?

4) if I am able to register a company and transfer my H1b visa, do I need to resign my current job or can I continue my day job and work for building my app after 9-5 hours so that I have a constant income while I build my app?

Please help me regarding this. I am also planning to consult an immigration lawyer regarding this but I want to ask the right questions when consulting the lawyer.