Hey there Mutana_Z!
I have a particular workflow but don’t really have any tutorials on it. I sort of just taught myself for the most part. But essentially when it comes to faces I begin in Zbrush with a base sculpt and then tweak the facial features in the first or second subdivsion to get the shape I want. I would then create different expression face morphs once I’ve settled on the look. I haven’t really delved too deeply into facial capture with LiveLink or anything like that yet. Just starting to get my feet wet in that area.
My advice would be to find a good base body sculpt if you’re a beginner, and just go from there. For the most part MetaHuman Creator seems to have a decent asset when it comes to the body too, though I’m not sure how dense the topology is for the body. Though I’d imagine it isn’t too much. You should be able to start there. =)