I don't mean to rain on your parade, but I don't know how you can be a person soon to be working in GA whilst still sitting your CPL exams. It might seem like the logical step, but there is alot for you to do before that happens. Speak to some of the unemployed pilots (fully qualified) up North, I'm sure some of them wouldn't be a confident as you when it comes to working in GA.
As for your question about ATPL's, Don't leave home without them!
Good Luck