As an employee, you don't work for no salary, period.
As a cofounder, you should get a significant share of the business (around the same % as the others have).
As a cofounder, you should get a significant share of the business (around the same % as the others have).
What about if it's not a public company? That is, 2 or 3 people and an LLC?
In the UK, you can just decide how many shares the company has, and sell them for whatever amount per share you decide - that way you split the company between several founders. Of course, if you want more complicated stuff, like vesting, you'll probably want to speak to a solicitor.