brakes creak caliper

Can someone tell me the correct order to bleed brakes? I think I should bleed the right rear then the left rear followed by the right front then the left front. Am I correct or is it different? Thanks to anyone who can confirm.

Was driving slowly through a animal safari, when brakes were pressed I would hear a creaking sound, not a squeaking. Sounded like was coming from caliper area. Perhaps some debris got in there? Pads were at 4mm on last inspection and was told I should be good until fall. The creaking sound...