"If I wish to go Don Muang Airport from Pattaya using bus, which bus station or bus stop in Bangkok should I get off from the bus?"
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When you are in Bangkok you will have to use a taxi to complete your ride to Don Muang.
Maybe bus from Pattaya bus terminal to Morchit. Morchit is a little closer to Don Muang. Bus station is on North Pattaya Road.
See map for Pattaya. Locate North Pattaya Road. Bus station is on that road.
thaiwaysmagazine.com/pattaya_map/pattaya_map…
When using the meter taxi in Bangkok only pay the meter fare. Don't get in unless the taxi driver agrees to use the meter. I don't recall ever using a taxi from Morchit to Don Muang - if you only pay the meter (price is the same for 4 passengers but luggage room is limited) the ride is fairly priced. Have coins and small bills to pay the driver. Rough guess maybe 70-110 baht.
Bus from Pattaya does not run all night long! Last bus may still be 9 pm.
www.pattayabus.com/?page_id=1594&lang=en