Here is a basic strategy for new players building their first city.
Build 1 of every resource. Build 1 farm, 1 lumber mill, 1 quarry, and 1 iron mine. Upgrade each one evenly.
When you have an uneven number build lumber mills and farms.
This is a good beginner strategy. I find that I need more lumber and iron later in the game so I build extra lumber and iron instead of farms.