Advice on forming a writer's group

I was talking to a playwright friend from Michigan.  She says make up  
a flyer that describes your ideal colleagues and what you want to work  
on, plus gives a contact number, and pin it up on the multitude of  
bulletin boards and kiosks at the University-- and in libraries.  Also  
post the call on Craig's List.  You'll have an abundance of applicants  
from which to pick the most compatible.
We just formed a group via a PS paragraph in the suburb's weekly.   
This is in addition to the Oldest Established large group I've been in  
for 30 years, that only critiques actor-read completed pieces and has  
a long waiting list for its public readings/feedback.  The informal  
new group is small enough to respond to ideas and fragments as they  
emerge, and can save months of work on an unpromising direction.