If a teacher undertakes the task of being a club advisor they should be the following:
-responsible party for team functions within school building, i.e meetings, build days/nights, permits for facility usage, travel plan approval(s), maintaining club standards as far as team member grades/attendance etc.
-team registrations via TIMS, now i encourage students to help me with bookkeeping and paperwork, however it is my responsibility.
-financial management
-chaperone on any trips, events etc
-basically the person who always gets into trouble

(my schools usually cut me a lot of slack and understand how big an undertaking this is)
- best to have one person to start off, to not scare anyone, then i highly recommend approx 1 mentor/advisor per 10.
good luck