After you get off the plain, walk to the Passport Control counters where Thai Immigration authorities will check your passport and visa, if you have one. Otherwise, the visa on arrival will be stamped in your passport. During the flight you have probably filled out the Immigration form. Get your passport and that Immigration form ready to present them at the Immigration counter. Depending on the number of arriving passengers, it is quite a brief process, and you'll get your passport back with the stamped Immigration card attached. Keep them safe, you'll not need your passport until the check-in at the hotel, unless you intend to withdraw money from your traveller's check. Be advised, the exchange rates in banks inside the Airport are less favorable than in town.

Now, you are already in the Kingdom of Thailand and subject to the Thai law. Walk or take an escalator downstairs to the baggage claim hall where you can pick up your luggage, if any. There are also Duty Free and some other shops. Next, proceed to the Customs Control counters, which are also in that hall. If you have nothing to declare, pass through one of the green-light lines and you will be entering into the Meeting Hall, right behind large sliding doors. No matter whether your flight had landed in Terminal 1 or 2, as you're entering into the Meeting Hall, turn to your right and walk to the Meeting Point. There you'll see our representative amongst many people awaiting for arriving passengers and showing their banners and signs.