Machine Knitting Etc. is a site where you can download .pdf’s of the instruction manuals as well as service manuals for many models of knitting machines.
Knit it Now is a site loaded with info about MK, and covers most machines generically. I have gotten to know the owner quite well, and Sue is very knowledgeable. There is a free side and a paid subscription side, and I have to admit that I lurked on the free side for a few months before subscribing. The many free resources there are very useful, and the paid side includes a ton of step-by-step tutorials, as well as basic patterns that can be adjusted to any gauge and size. Sue is also a great motivator–interacting with this website will encourage you to knit.
Hi. I just started a YouTube channel with free circular knitting machine patterns called Danelichic Handmade. I will be posting new videos every week. Here is a link to one of my free patterns. https://youtu.be/jxE3kCXHYuc