I'd like to start joining sessions through the Case Partners function of this site, but I'm unsure of how to prepare. Do candidates bring their own cases to these sessions? Is there a repository in which I can find example cases to bring or generate my own? What should I know when creating cases for practice sessions?
Where do candidates get the cases they use for practice sessions with case partners?
I'd suggest you choose a case (starting with the prep lounge ones is easier if there are exhibits to be shared with the interviewee), have someone interview you with it in order to understand it well; i found this step to be essential in really understanding the case and hence be a better interviewer. The ball will roll quite quickly from there
You don't really need to create a case, you can tailor an existing one :)
Asides from the collection on PrepLounge, you can look for the unversity consulting club books on Google.
YOu can do both, either bring your own case or use the case which prep-lounge prepared for you.