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With most airlines you now have 3 options:
Go to their webpage and the "manage my booking" option or similar. It will ask for your reservation code and probably surname. You will be able to print your tickets, and possibly check in and print boarding passes (the timing on this will depend on your flight, airline etc)
Install their mobile app (if they have one), input the same information as above, and receive tickets and boarding passes on your phone.
Wait until you get to the airport, and use your reservation code at the airline's desk. Be aware some airlines no longer have an airport presence for this, or may charge for it.
Depending on the flight and airline, the process may ask for various forms of ID.