To get started with our new Drupal Commerce store, we are installing Drupal using the Commerce Kickstart installation profile. Commerce Kickstart provides you with Drupal core, along with a number of modules that all Commerce sites will need to get up and running. Using the installation profile makes your life a lot easier since you have everything you need in one package and the Drupal installer will make sure that you don't hit annoying PHP timeouts when trying to enable all those modules at the same time. It also installs a few sample products and handles some basic configuration.