One of the few people I have met in person and trust with instruction on an AK is Rob Ski (it does help that Rob has a real accent, not a fake one like some other infamous YouTuber). Fresh up from his growing comradery of AK operators is a video on the basic AK reloading. I enjoy that he is not focusing on advanced techniques, instead opting to use build-in index points on the rifle.
(I just had to capture Rob Ski with a war face on).