You can either do this by going on the Village screen and selecting each upgrade from the build menu in the corner, or by tapping the icon on each structure and tapping them each time you have enough coins to pay for it. Each village has around five structures to complete, with each having five increasingly expensive upgrades.
Upgrading your Coin Master village requires nothing more than massive stacks of in-game cash. + 2 How to upgrade your village in Coin Master
