You will need to consider the prequisite requirements that are not covered in your current manual. Technical Specification ISO 22002 specifies detailed requirements to be specifically considered in relation to ISO 22000:2005, 7.2.3: In addition, it adds other aspects which are considered relevant to manufacturing operations:
1) rework;
2) product recall procedures;
3) warehousing;
4) product information and consumer awareness;
5) food defence, biovigilance and bioterrorism.
I have posted previously on FSSC 22000 certification requirements, you can see a summary here, note that there are addition FSSC requirements as well as complying with ISO 22002.
Kind regards,
Tony