Create an Animation

I would like an short intro clip for my league of legends channel. What I want is: the intro starts out with Renekton (a character from league of legends looks like a standing crocodile) standing and the letter "S" will fall from the top of the screen to the right of Renekton and the letter "O" will fall to the Left. Then the letters will start to squish Renekton between them. Renekton will first push the "S" away then start to push the "O" away. Renekton should then have his legs spread and his hands pushing the "O" and the Renekton forms an "R" with his body leaving "SRO" on the screen. The intro should then end. Fitting music of course and sound effects when Renekton attempts to move the letters.