Hi I will be assisting the chapter adviser when I can & a prospective AI for the same GLO. I just wanted to say Good Luck with recruitment...w/ 20 houses I'm confident you will find your home.
To get answers to some of your ???s try some the following below: (hope this helps)
A) Check w/ Panhellenic council to find out if upper classmen are or are not counted against houses "Freebies" during formal recruitment.
B) Find out if there are any info sessions scheduled before the recruitment dates? If so they should be able to tell you what you need to know and what to wear etc.
C) If there aren't any info sessions, I would check with the Greek advisor on campus; perhaps s/he can point you the right way if the info isn't listed on the school webpage. Most GLO sections of campus websites will list a contact # and or email for the Greek advisor (some please correct me if I'm wrong).
Edited for typos.