My bike's better than me!
Join Date: Feb 2005
Location: Northern Colorado
Posts: 2,041
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
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In all sincerity ... and with no disrespect ... the ParkTool link and Sheldon Brown (RIP!) links rather cover it.
In 99.9% of cases, it's a process of methodically and systematically removing, cleaning, and re-torquing (to spec) one thing/set of things (eg, chainring bolts) at a time until it's been isolated.
In the remainder of cases, it's probably a crack IN the frame about 90% of that 1/10th of a % of cases.
But it's /verrrrry/ rare that somebody's creak/squeak/noise isn't resolved through patient trial and error.
BTW: I'm going with bb on yours, too: remove, clean, lube (grease/anti-seize/teflon tape -- your choice), and torque to spec.
Got that torque wrench yet? ;-)