If you want to compete with others take a look at this :

League of Legends :

Download :
https://signup.na.leagueoflegends.com/en/signup/redownload

Enjoy the play :
https://www.youtube.com/watch?v=bfRCLAUzMfY


Learn your toon :
http://leagueoflegends.wikia.com/wiki/League_of_Legends_Wiki