ArcSine is right - the Operating Agreement will be the governing document for selling shareholders.
As far as values - the simple back-of-the-envelope methodology for valuing firms is a multiple of EBITDA. If you've been in the industry a bit, you should have a sense of what the multiples are. Of course, there are a lot of variables that affect the multiple - consistency of cash flows, capex, customer concentration just to name a few.
Once you have that number, and don't forget to add back you compensation, if you were taking any, the resulting product of the multiple and EBITDA is the Enterprise Value. To get to the equity value, you will need to deduct the debt and add cash. Then take the equity value and multiply it by the percent ownership you have.
Nothing is ever that simple, but at least it will give you a frame work.
If the company does not have the cash to pay you, take a note, but make sure it's secured. If you partners just outright reject you, see if there are any restrictions to selling your interests to a third party (not that there will be a big market for that), but you could use the the threat of selling shares to a competitor to get them to work with you (I know it's hardball, but ...).
Good luck,
Nick
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