You've come to the right place! Welcome. There is a lot of information here on vccachat, and even more is available when you join the VCCA, which I strongly recommend. The club has lots of knowledgeable guys, fun activities, and access to lots of parts. There is a technical advisor who is an expert on your truck. If you go to vcca.org you can see more about us.
In addition to what Tiny recommended (the shop manual), I recommend that you also buy reprints of the owner's manual and the Master Parts Price List. Both will be very useful as you restore your truck. All three are available at
www.fillingstation.com and from other vendors.
Meanwhile, learn how to use the search function on this site and you'll find a ton of information about these old beauties. There are literally tens of thousands of posts about your truck.
Again, welcome. Enjoy your new old Chevy.
All the Best, Chip