I am looking to work at an early stage startup, and I am currently negotiating with founders of several such startups. All of these startups have just raised their first funding, and for each of them I will be part of the first layer of real employees. After learning about these startups, I know that being part of any one of them will be extremely exciting for me, and I intend to put in my heart and soul to make the startup succeed. However, I still have the final stage of the negotiations ahead of me, and I am a complete noob in the world of startups.
How do I negotiate so that I end up with a fair amount of equity?
From what the founders told me so far about how they intend to divide ownership, it seems more or less along the lines of Joel Spolsky's method. I agree with this method, its principles look reasonable and fair: the founders get much more shares than me since they took a much greater risk, vesting is essential, investments dilute everyone etc.
However this is a just a declaration of the founders' intentions for how the ownership will end up being divided a few years from now. How do I know that these intentions will indeed become reality?
What questions should I be asking during the negotiations? Are there specific clauses I need to have in my contract? What are some scenarios that can occur down the line and that I should be considering now?
Note that I am aware of the usual risks startups face. I know that most startups fail, and probably the one I'll end up joining will fail too. In that case whatever equity I may have will be worth squat, and what I've earned is just the experience of being part of an early stage startup. I'm willing to take that risk. What I'm scared of is that the startup will succeed, and I won't get my fair share, despite the founders current declarations.