Since this is a new airplane to you, you'll start on the ground with the engines off. You're at the Jefferson County (Jeffco) airport (KBJC) just outside of Denver, Colorado. The winds are calm, and the day is fair. This is perfect for an aircraft checkout.
Before you even start the engines, you need to get your windows arranged. During the next few missions, you'll want to be able to juggle the different Baron windows smoothly, particularly the throttle quadrant. Make sure you're in 2D cockpit to start. The 3D, virtual cockpit is stunning and fun to fly if your computer has the processing horsepower to make it work, but it's easier to learn your way around in the 2D view first.
Ref.: West, Jeff Van. Microsoft Flight Simulator X For Pilots: Real World Training. Wiley. Kindle Edition(Location 11728).