Your main goal is to supply your home town together with your team members as best a possible. Supplying your home town is done via your market booth.
When you sell goods in your market booth the goods are bought by the local villagers to fulfill their needs. The more you sell, the more satisfied they are. The more satisfied, the faster your town grows and you you can hire new workers more often.
The town growth depends on the average satisfaction level of the last 24 hours. You need to reach at least a satisfaction level per good of 3 while the optimal satisfaction level is 8 or higher.
Some goods are always on "High Demand". You should focus on this goods first, as they give you four times more population growth.