Same as all other licenses, you will need to write 6 exams, which can be done as soon as you received your CPL license.
These exams are the following:
Flight Planning & Navigation
Aircraft Technical & General
Not less than 1500hrs of which must include:
200hrs cross country
75hrs Instruments – 30hrs may be on FSTD
100 night as PIC
This course does not require much training, just some time in an approved FSTD device to prep for your test. All difference is that the leeway between deviations are much less in flight and testing much stricter. It is also done in a Multi Crew environment to see how you handle Multi Crew operations.