Normally I would say get straight into the ATPL exams, but with the current job market, and the 3yr time limit post exams to IR, best delay.
Build hrs, get a night rating, consider the IMC or MEP rating as a foot in the door to the IR and look to take the exams towards the end of the year if there are signs of an improvement. At the moment, as you will already know i'm sure, there are virtually no jobs for low hrs pilots and even flying instructors are having a tough time. Things will improve on the job market, but at the moment its a matter of timing!