There are BDSM 'Limits Lists' out there that some people find useful to negotiate the range of their activities. However, my suggestion would be that you invent this list yourselves - together. You're only limited by your imagination as to what gets included on this list and the first list you make doesn't need to be the definitive one.
A good way to begin is to break the myriad of activities down into several headings. For example, Bondage, Corporal Punishment, Fetishes, Humiliation, Role Play, Submission and Torture. From there, talk with each other about activities that could be listed under each heading and maybe rate each with your levels of interest/willingness to try it. What you will likely find is that you'll differ in opinion about categories. What one person might consider to be extreme humiliation may to another, be a relatively routine submissive service. This then is where you negotiate to see whether things get included or excluded. Approaching the list this way opens up the possibilities of everything you possibly can do, rather than focussing on the things you won't do (as often happens with traditional Limits Lists)
It's important to also note that whatever list you make isn't set in stone. Be prepared to review it often -- make changes as you go. Most importantly, have fun!
anonymouse