How should I negotiate for equity in a company?
As I see it. I've got a couple of bargaining chips. 1) I've got a good amount of acknowledged experience and knowledge in both fields (theirs and mine). 2) They would like more work out of me then they have ability to pay for. 3) I've got a heck of a lot more knowledge in leveraging mediums such as twitter, and blogs. 4) I would love to spend more time on the company then just coding a back end.
I'm also not sure exactly what I'm asking for and what's reasonable to ask for. I'd rather make money monthly from the business then when they might sell it down the line, but I don't even know if that's a smart. I could alternatively build the system and lease it to them, but then they have less incentive to work with me and I wouldn't have nearly as much of a stake.
I've never worked with a company where this seemed like a viable option, so I've never had a chance to negotiate. Any tips on how I should go about this and what I might ask for?