For f's sake Seanus will you quit with your pro Callan b.s.
Actually, he's not very pro-Callan and can probably tell you in ten million ways where it fails.
Look it's a crap system if you have any creativity and experience or good training in teaching a language. It's out of date and completely impractical in terms of realistic communication.
I don't think anyone's arguing with the fact that it's out of date. But a good school will encourage creativity with it - and if it's used for the foundations of learning, supplementing it with proper grammar teaching - then it's actually not terrible for complete beginners. But this does take talent from teachers - and good teachers will let students speak freely and not insist that they stick rigidly to THE METHOD.
Of course, bad schools will stick rigidly to it - with the subsequent consequences of being absolutely terrible. Different things for different people.
I did it for 2 years and it served to train me more than it served to help students acquire the language- and my delivery was considered damn near perfect by the students and my bosses. But guess what? I realized that it has more drawbacks than what it can offer.
Which backs up our point - it's fantastic for new teachers to get to grips with the teaching environment. And more to the point - if you're doing it solely for money, then Callan can actually be better for the teacher than traditional lessons because of the comical lack of preparation needed.
Go volunteer at your local whatever. Take your CELTA with a trainer (or more often the case trainers) who has a good reputation as this will make a huge difference with what you come away with. Take it seriously and if you can only manage a pass C then you didn't take it seriously enough. Then take what you can get your first year and build a reputation.
The thing is that he'll be coming mid-year and won't have lots of schools to pick and choose from - he'll be looking to get whatever he can. In this circumstance, working in a Callan school just to get to grips with things is not a bad idea at all. Yes, it's rubbish - but it crucially should allow you to experiment with things before you start in a 'real' classroom.
so if you can't give something prepared then scale back until you got the preparation bit aced.
Which again, if you're talking about solely money - it's much better to teach Callan and have no preparation for 45zl an hour than it is to teach traditionally (with lesson prep) for 50zl an hour.