I'm about to start exactly the same as you m'lady, so i'm in the same position.
A few i've come up with so far are:
Do you do your CPL on a Multi Aircraft or SEP? How does this affect the cost?
How many hours do an average student take to complete the CPL / IR - is it much above min requirements?
Is local accomodation easily sourced, should it be required?
Do you operate / have any recommendation schemes or tie ups with airlines?
What aircraft do you operate? How often are they down for maintenance?
Will I get a dedicated instructor?
Can I speak with other students?
What other ancillary costs should i consider (landing fees, nav charges, etc) - how much are they likely to be?
Is the exam held on site or do i need to commute?
Any more questions are welcomed. PM in your box vectis.
Horgy