You are the [insert chosen title here] of the [chosen ship name]. Your predecessor's mission was to establish a colony in Proxima Centauri. Unfortunately the generation ship experienced a problem with the storage drives a few hundred years into the journey, and you and most of the others on the ship have only scattered knowledge of Earth, true orbital mechanics, and how the ship really works. For all you know, there may already be humans in the star system. Over the roughly 80,000 year journey, not much is known. You're certain the ship had communications with Earth, however something happened before the drive corruption and you don't have communications now.
About the ShipThe ship is constructed as a rotating ring with farms on the inside to provide food. It's easily a few miles in radius. You presume it was constructed in orbit, and signs indicate it was a last-ditch effort to relieve overcrowding. There are is easily enough space for hundreds of millions of people on the 25-mile long ring, even a billion. Now, however, the population is much smaller-only a few million.
Propulsion is provided by eight conventional liquid-fuel engines, and you presume the ship used most of the fuel to decelerate from interplanetary speed. (The ship ran on autopilot until now; the only notification of its arrival was a loud beep and a "Autopilot disengaged"). Power is provided by a low output fusion reactor.
There are a lot of buttons on the console, and since most of them had no use while on autopilot you have no idea what they do. There are other seats for bridge crew to sit on, but they are never used, seeing as the ship was flying itself. From what you can tell, the ship is unarmed.
You have no idea what to do first; the autopilot has just disengaged. What do you do first?
tl;dr: You got a starship but no clue as to how to work it

If you want to know more about the ship, just ask. Keep in mind that I (sadly) don't have a very good track record when it comes to keeping things going, but hopefully I can at least keep this going for a while.