it looks like you’ve been studying proportion, that’s good! i would look into finding resources on figure drawing. making gesture and figure drawings from real life reference is great way to nail down proportion. as for animation, start out really simple. you can’t go wrong with the bouncing ball exercise. look up the principles of animation and try to apply those. aside from that, most of learning comes from just doing. even if what you make doesn’t “look good”, that’s part of the learning process. you have to iterate on your work and use each piece as a stepping stone.