The Wolf rank is for boys who have completed first grade (or who are 8 years old). To become a Wolf Cub Scout, a boy must pass 12 achievements involving simple physical and mental skills (see Wolf handbook). The den leader keeps a record of the progress on the Cub Scout Den Advancement Chart and recognizes him at a den meeting for completing each milestone.
When a boy has completed the 12 achievements, the den leader indicates this on the Advancement Report and gives it to the pack committee so awards can be purchased. The Wolf badge is presented to the scout to wear on his uniform.
After he has earned the Wolf badge, a boy is encouraged to work on the 23 Wolf electives until he completes second grade (or turns 9 years old). More than 100 elective projects are aimed at kindling his interest in new hobbies, as well as teaching him skills that will be useful during his Boy Scout years.
If you are looking for a handbook here is electronic version.
If you are looking for a Cub Scout Uniform Sheet