Yeah but that’s for modeling and rigging, it doesn’t include the part you want.
(I thought you already had a model because the question was on IK which would be the next step and you provided a screenshot of a model, but if not, yeah sure you can follow that to create your own model and rig first and then move on with the IK logic)
Also, before your edit, I actually responded to this question of yours via private messages:
We can move our casual chat to the private messages section of this platform or maybe Discord if you insist. I prefer not doing that under a topic.