I have a lot of questions about shareholder agreements in general and how to split shares/equity and class of share allocation. How to relate work done to shares assigned ?
I would suggest meeting with a qualified attorney. The sooner you have elements in writing the sooner people know exactly in writing where they stand. In most cases the longer your allow or support founders or employees to assume or work on verbal or handshake agreements, the greater risk you are for conflict at some point. But there is also something to be said for not jumping into a contract until you are at the appropriate time where you have properly vetted your overall approach to your business as well as the type and quality of individuals you will be working with. The only thing worse than not having proper contracts in place is to have proper contracts in place with the wrong people.
1) See what your attorney says;
2) Read 'Angel' by Jason Calacanis.