A good place for a group like this to start could be looking at previous efforts where new technologies have been regulated successfully. 

Examples: CRISPR on human embryos, the Treaty on the Prohibition of nuclear weapons, The Biological Weapons Convention, and maybe slightly different angle: the Antarctic Treaty seemed to be effective at slowing down something that was competitive between countries and yet allowed important scientific research to continue in an international cooperation. 

Maybe looking at some of these case studies could be a good starting point to consider the similarities/differences to AI? E.g. 

• Were the above regulations on technology that was already in use, or emerging? 
• Was public opinion important in pushing for the regulation? Or was the public hardly involved at all?
• Who was incentivised to develop this new technology/research? Who was it funded by? (companies, governments, philanthropy, NGOs, users) 
• Who served to benefit from the  technology being developed? Did people make counterfactual arguments at the time? (e.g. if we develop the tech further, it's extremely likely that great medicine will be developed, alongside something dangerous / untenable)