I don't know about electoral enrolment, bu the official address of the college is probably simply "Earle Page College, University of New England, Armidale NSW, 2351".
I don't know how EPC works it, but I don't recall paying immediately paying when enrolment was accepted. Duval has several varieties of payment on offer (ie year-long, term-based and monthly) and they usually like to know that you will be joining them before they ask you for payment. Once you've been offered a place at college and accepted it, you should receive a package in the mail. Ours simply had a letter saying "thanks for confirming", payment options and timetable for O Week.