So... I'm accepting friend requests to talk about Source filmmaker. I'm very communicative, if you want someone to talk about animation or something else, i would be glad to have you in my friend list.

Look at jess baumgartner's videos (Blocking pass).
Link to his channel:
https://www.youtube.com/user/jbaum181/videos
Link to an video that he told (about Overwatch animation and character posing): https://www.youtube.com/watch?v=ZmLkVtqjf1A

I highly recommend Jess Baumgartner's channel. He made videos that shows the blocking pass. It's great for general understanding for beginners and peoples that don't know how to organize their work. https://www.youtube.com/user/jbaum181/videos

It's better work with motion editor to make the key poses, after that, start animating and editing with keyframe editor.