If you own one of multiple AK clones, Blue Force Gear has laid out a comprehensive how-to guide on slinging your rifle.
For example, the AKM will require a Vickers Sling with Uloop Hardware. They not only tell you how to rig the sling, but also offer links to the right parts. This one is pretty straightforward, but several are more involved and they have photos to help guide you through the process.
?www.blueforcegear.com/articles/post/AK-sling-news-post