Hi, I can open your Spine files but you didn't include the images so I don't see your character.
But honestly, Søren Nielsen already cover all you questions in his tutorial videos. Have you checked his tutorial videos before?
For the rest, you need to be patient. There is no magic buttons to create beautiful animations. Spine is just a tool. You need to learn those animation principles. Squash and Stretch, overlapping, anticipation, arcs, exaggeration, good posing, ect...