Hey there!
ZONES is an entirely different game from Courier, both mechanically and thematically. In ZONES, you are playing a more "standard" RPG experience using the Mausritter ruleset. If you've seen anything on Mausritter, then you'll understand what ZONES offers, just with guns and humans instead of mice.
Everything you need for solo play is included in the ZONES core rules, such as generating locations, factions, encounters, NPCs, and more. You will need to fill in the gaps, but the game leads you through creating a ZONE (19 hex-tile area) filled with things happening that the player can interact with.
Hope that helps.