Hello all

I am working on a devised show currently -- we're in pre production now... which is mostly just logistics, since there's not a script to go off of, obviously. This is the first time I have ever been a part of devised theatre and was wondering if any of you have advice or tips for going into the rehearsal process? If you have worked on a devised show, what sort of things did you do to prepare for rehearsals? Or while in rehearsals? I imagine that once the script is created, rehearsals become more similar to a standard theatre production... but what do I do until then??
Any advice or help at all is more than welcome.
Thank you all a thousand times!