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Dear Rahul,
I just used the wiki of the Freesurfer functions, the information is very complete. If you want to use Freesurfer, you can start by doing the cortical reconstruction process for each subject ( https://secure-web.cisco.com/1Lj_XzmtE_iAYreTtmjwq2Q0VTCaZWdcX4QFapQPQO_Y7jt...) and then prepare the maps to do the analysis that interests you. In the case of PET analysis, you can follow the steps explained on the PetSurfer wiki ( https://secure-web.cisco.com/1SUsUq0XwDtpjwx2dSpE1KOdwDPRl2MG5fyhegdBeDHaK3K...). If you have any particular questions about feature options, you can search this list if other users have asked before. In case the question is not resolved, you can ask it here so that the experts can answer you.
I hope it helps.
Cheers,
Marina.