If the hike is a good size (fit) for you, it is a great bike to learn about maintenance. My estimate is that you should be between 6 feet and 6 feet 4 inches tall to fit a 63 cm bike. You will find a good explanation of bike fit on Google.
Truing a wheel is a bit of an art. Take the bike to a local bike shop and ask what it costs. If its reasonable, get it done there.
Buy a bottle of chain lube (oil) and start riding.
Enjoy.