Pre-Civilization Bronze Age
You need to assign your people to several different tasks: farming, defense, sheep herding, fishing, mining, and research. Assign people to farming, sheep herding and fishing to feed your people and grow your population. Assign people to research technology in order to get bonuses and new buildings. Assign people to mining to build buildings that give you extra bonuses. Make sure you have enough people defending your town too (always make sure that the number next to the skull is black). Hit the [+] button next to a job to assign one of your defenders to do it, or press the [-] button to remove a worker and make them a defender.
The interface is a little big, so try right clicking on the game, then pressing "Enter Fullscren".