The good news is the plane will probably have a sophisticated autopilot that can take care of most of the flying for you. The bad news is you will still probably have to land it, and every aircraft cockpit is going to be different, so it’s not like you’d know exactly where to look to find the things you need.
So, let’s take an example aircraft — (you guessed it) the 737. The first thing you’re going to want to do is put on the pilot’s headset, and find the pilot’s audio controls. Click on the link for the step-by-step instructions.
(1) Tim Morgan’s answer to Aviation: What should I do if the pilot passes out and I (with no flight training) have to land the plane? – Quora.