The official map maker is indeed out now, and guides will be here very soon, get the editor at: http://www.minecraftforum.net/topic/81715-173-coros-mods-destructive-tornadoes-v03-zombiecraft-map-editor-zombie-awareness-pets-nm-mode-moveplus/#zombiecraft
However, some users make maps in vanilla minecraft, with a modified version of the texture pack LAST DAYS by History. The vanilla maps do not run in zombiecraft, nor do they have weapons or other map elements. Users will add these gameplay objects when the map maker if released, if the map maker is compatible with vanilla maps.
A link to the modified texture pack can be found here.
More will be added when the map maker is available, such as tutorials and tips
The map maker has been confirmed by VinexNike
Different texture packs have been confirmed by VinexNike