Moz has really good guides. I haven't used their social media guide myself, but I like their other stuff a lot - easy to understand and useful.
There are likely better YouTube videos about the minutiae of doing specific things on each social media platform, such as posting your link on your facebook business page. The challenge is finding the one that is right for you and your level of knowledge.
If you have specific questions, feel free to PM me and I can see what I can do to help you.