Games Workshop is pushing a base set of rules to that you can download for free to pull new people into the game. Check these out.
Download the WarCry free Core Rules
You can also download Warhammer Age of Sigmar Warscrolls for the two warbands in the box – the Rotmire Creed and the Horns of Hashut – as well as for the Chaos Legionnaires and the Centaurion Marshal, all for free. Grab them now and bring ruin to the Mortal Realms.