Welcome to the 'bolt.
Oh neat, a family heirloom.
Well, you are in the right place, wander around the site and get a feel for the place.
post up details, ask questions, the parts are still out there.
As for the truck, if it is running, then just make sure it is safe to drive.
Then just drive it, it will let you know what it needs.
Don't rush into tearing it apart. Some people get what I call, restoration-itis.
It's Grandpa's old truck, so just wash it good, wax parts of it maybe, lubricate everything.
A lot of the stuff you can probably learn to do yourself if you know anything about basic hand tools.
that's the fun with old trucks, you can take a lot of it apart.
edit : Oh wow, I just found the link to the photos - that's a nice old truck!
do the mechanical stuff, safety first and drive it!
-W