User summary (taken from the back of the books and the series itself).
Sagard the Barbarian is a series of gamebooks by Gary Gygax and Flint Dille. Illustrated by Leslie Morrill and Ian McCaig.
The series follows the adventures of Sagard the Barbarian as he journeys across the land. The world isn't named however references in the books would seem to indicate that it is set in the Dungeons & Dragons world of Greyhawk which was also created by Gary Gygax.
The series is easy to play and seems like an introduction to gamebooks. No accessories are required as even the randomisation for combat is achieved through flipping the pages which have random numbers at the top right.