Start with only a handful of peasants and put them to work. Make them explore new lands, gather food and resources or simply make them devote their lives to entertaining the masses. Life is a tough adventure when you have to hunt and kill mammoths, so why not encourage your population to pursue a more quiet life by settling down, building houses and farming lands for food? Once your citizens settle down they will be able to develop more efficient ways of interacting with their environment.
Trade with neighbouring civilizations to gain money and riches. Become a true capitalist or spend it all on research to discover new technologies. You can also use gold and resources to increase your population and expand your city. You're free to choose the path to glory for your loyal followers. The choice is yours!
Guide your tribe through the stone age by inventing fire and other groundbreaking discoveries to build a civilization with thousands or even millions of people. Inventing fire is just the start of the adventure though! There are many more things left to discover out there! Guide your people and see them evolve! And best of all: It's a free game! Don't forget to occasionally check up on the progress of your inhabitants and see how they farm, chop wood, mine, sing and trade. You really don't want to be idle in this amazing idle game!