There are 2 ways to increase the speed of the processor; raise the base clock or raise the CPU's clock multiplier of the base clock (in BIOS). Since the FX-6300 has an unlocked multiplier, that is the easiest way. Eventually, you will get it to an unstable state that will need SLIGHT bumps in the CPUs' Vcore (voltage). But if this is your 1st attempt at O/C'ing, just play with the multiplier. Besides, that MB is not a great board for taking to extremes.
Take the multiplier up a click at a time and test the stability of the system with something like Prime95 for about an hour. If it remains stable, take it another click... etc. But keep an eye on temps during the Prime95 runs.