Ask HN: What kind of company should F1 register: Nevada C corp/Offshore?

Currently I have two business ideas in my mind: one is sales based and the other one is service based. After doing some research, I realize my options are limited. So I am wondering what kind of company should I register? And as an offshare company, can I still do sales operations in the US? I don't plan to draw any money from these companies since if they are proved to be profitable, I can easily get investment to make me work for my own company legally.