You not entitled to any amount. It is a matter of leverage and how much they want you. My advice is to make sure you reach an understanding in writing as to how you will be paid and how much work you will be reqired to provide before you take the position. You need to know who else will have equity shares and what they are expected to contributed. I just don't know enough about the company to provide you any more advice
While you are not entitled to any equity in the company as a matter of law, and the amount of stock that you receive is a matter to be negotiated between you and your associate, there are other matters to consider. In addition to a written agreement regarding how you will accrue stock to compensate for your efforts, you and your associate should write a carefully constructed agreement that lays out your obligations to each other on a day-to-day business. The most prudent course of action for you would be to consult a competent attorney to represent you alone in these negotiations. Do not attempt to have one attorney represent both you and your associate.
As agreed, you are not entitled to anything. What compensation you get is a matter of negotiation between you and the company. What you will be doing for the company, time commitments, risk, the benefit of your efforts, and much more are all factors. This is not really the place to get good advice on what and how to negotiate. You should locate an attorney or consultant familiar with the market, the job, etc. that can help you determine some benchmarks and to whom you can reveal more details on a confidential nature.
DISCLAIMER: This answer is provided in response to a "hypothetical" question and provided for general, informational purposes and does not create an attorney/client relationship. The information presented is not legal advice and may change based additional information and research. It is recommended that you speak to an attorney to discuss your specific legal issues.