Phoenix09
If you are going to go to the trouble of doing the cpl exams you really would be as well sitting the atpl's. There is about 20-30% extra work involved but you then won't need to do any more exams if at a later date you decide that instructing is'nt for you.
Instructing is a good job but the remuneration package aint all that great and until all the hours builders and part time instructors get out the way the situation won't improve.
To be a career instructor you will have to be very determined and focused to get through all the training and then be able to live on a minimal salary. That is assuming you manage to get a job.
Good luck
By the way, at the moment Tayside aviation in Dundee are looking for instructors.