Someone is asking me to join a start-up upstairs market making firm, I'm just trying to do some due dilligence and understand the proces better. So far, I was not able to find anything on the web, so decided to ask here: What goes into starting an upstairs futures-options market making firm? What are the fees involved, other than execution fees? What are the capital requirements? What kind of legal infrastructure is required? Any link would help too, so far I could not find anything...