Traveling to the capital of the "Land of Ice", Iceland, your plane will land at Keflavik International Airport. Reykjavik itself has an airport that serves domestic flights.
It is recommended to arrive at the airport 2.5 - 3 hours before departure.
It is better tocheck in online or at self-check-in machines.
In almost all airports boarding is possible using electronic boarding passes. But there are some where you need to print it out. You can see this information on your airline's website when checking in.