You will need to obtain a standalone FAA CPL/IR or ATP first, then:
1. Complete knowledge tests (FOI & CFI);
2. Minimum 3 hours training with FAA Instructor;
3. Complete CFI checkride (probably with FAA as its still considered as an initial instructor certificate;
4. Repeat for CFII and MEI. No additional knowledge test for MEI, and FOI does not need to be taken for successive add-ons.
ifitaint...
Edited to add: Requirements at 14 CFR 61.181 et seq.
Last edited by ifitaintboeing; 14th March 2013 at 22:29.