How do i change the player model look?

I want to make mlp game, but i don't know how to change the player look. i want to make it look like a pony, but i don't know how. Also, how do i get the animations? make the animations of movement? First question is most inportant! Thnx for you'r answer. To be more precised-i want to change the player model. Thank you :)