Hi Pedro
The first thing I would do is buy a repair manual and a parts manual. Brian Asbury and Grant Bowker, both on this site, have excellent reproductions. Above all don't get discouraged as this restoration will take considerable time. You are starting off the job in the right way by stripping the truck of the non CMP gear. I would then do an evaluation of what you have and what you need. Remember you have been continually perusing those manuals while occupying the white throne.
Change all the fluids and try to get it moving to assess the drive train but be careful there are probably no brakes. The other guys in the west are great and some may be close to you. They can give you invaluable assistance. Again Brian Asbury (Ontario) has parts and someone will give you his phone number or I can get it for you. Dirk Leegwater in the Netherlands also has tons of stuff. Just Google LWD parts.
Good luck and be patient.
Barry