Here is a Video from the cockpit of Airbus A320; taken from Microsoft Flight Simulator. In the video we look at steps involved in preparing the cockpit before departing for a flight. This is called as Cockpit Preparation and Pilots are required to follow a Cockpit Preparation checklist which lists out the actions that need to be completed for a safe flight.
Then we look at a how an aircraft's jet engines are started and how a proper engine start is identified by looking at the parameters. Engines are usually started during Pushback after getting proper clearances from ATC and ground personnel.
This episode concludes with the end of pushback. The Next Episode will be out soon, regarding taxiing an aircraft and takeoff.

Video Taken from: Microsoft Flight Simulator, Steam Edition with A320 Add On