II have created a GPO that I only want to apply to a certain group of users within an OU. Can I simply link the GPO to this group?


You cannot link a GPO to a group. GPOs can only be linked to a site, domain or OU. You can filter a GPO within its linked container by changing the default permissions on the GPO by using security groups. In this case, simply delete the Authenticated Users default group from the permissions and select the designated group and give it the Read and Apply Group Policy permissions.