Some things never change! I instructed full time for a few years in NZ and one thing I learnt is be careful of those Schools/Aero Clubs that offer you partime work if you do your instructors rating with them. You may end up grovelling for the odd introductory flight only once you qualify.They had this down to a fine art!
It ain't easy I know but the dodgy buggers are out there and instructors have always been shafted. Be careful and keep the eyes wide open, things aren't usually what they seem. Consider things like - how many instructors does the school already have, what is the potential for you to get hours once you qualify, how many other guys are doing the same thing and being offered part time work as well and how many FULLTIME staff are there already? Finally shop around! And good luck!
"Don't believe the hype"