Creating my own perfectly functional character (skeletal mesh) ?

Thank you for your time and answers. I’d love to see other people’s take on these questions. Some of the things you mentioned I already tried and it doesn’t work, and your answers are formulated very oddly, I have to go back and forth with my post to understand what you are talking about. And also I would love some explanations, not just do this and do that. I don’t wanna be rude or anything.