you should definitely have everything you need from them (financially, health care, etc) in hand before discussing. assume they will ask you to leave immediately. if they don't and you are able to give them the time, I think it is a classy move to help them out. but that should not mean do a bunch of crap you don't want to do (like perhaps onerous documentation). you could offer to be a consultant for a time if they need to use you.