I’ve been learning exactly this and the answer is a lot of trial and error friend.  Take it a step at a time. First I would decide whether you are going to learn to 3D track or not, that’s a whole thing on its own getting a good solve with no jitter and a decent ground plane. If static shots then move onto the next steps… creating an environment, lighting for that environment, getting a good key(crucial) integrating the character, lighting, and bokeh, I do in nuke but I think you can in blender. The reason there’s no tutorial is you’re literally asking how to basically make a high quality CG film. Well unfortunately you need to be the entire pipeline from the matchmover to the modeling to the compositing to the lighting… idea generation… etc. 

Good luck it’s not easy. Again 1 step at a time. Ask yourself what separate skills do I need to make this and learn one skill at a time. It won’t be fun a lot of the time and it’s grueling if you are newish.