Where should I start?
If you haven't played this mod yet, start a freeplay and go through the story. It teaches you the basics of how the mod works.
How can I grow the city?
Each city has basic needs. Currently those are water (provided via the water tower), and apples (provided via the market).
If the basic needs are met, the city will take construction materials from the town hall (currently stone+iron), and create new houses.
A growing city will increase the amount of basic needs items they consume. Make sure to scale up your production as well!
What's the purpose of growing a city?
The more citizens you have, the more currency you can get. You can use that currency to fund research in universities (i.e. produce science packs). Join the discussion on how citizens should help you .