Are you an NFL rookie? Watch our guide to all things American FootballThis video can not be playedTo play this video you need to enable JavaScript in your browser.Are you an NFL rookie? Watch our guide to all things American FootballCloseAre you an NFL rookie? If so, watch our guide to the key rules, the player positions and the ultimate aim of the game.SubsectionAmerican footballPublished2 October 2015Shareclose panelShare pageCopy linkAbout sharingRead description