hello rodfoster.
welcome to the forums!
i had that mainboard once, along with a PIII 800EB. that was a setup i could never overclock well, because the already high Front Side Bus (133MHz), that mainboard was not quite stable at the higher buses, so you might need good cooling on yours.
some of the tools everyone is using is:
Motherboard Monitor is far the best monitoring program of voltage, temperatures, rotations etc. this is a little bit complicated to configure at first. read information from help, or search the forums for other programs ppl are running.
Sisoft Sandra is a diagnostic utility for almost the whole system.
3dmark will stress the system and benchmark video performance and
Prime95 is one of the best programs to stress the system.
those are the basic tools ppl are running to test their systems. they are already about all you need to start overclocking yours safely.
there is
this guide to overclock intel processors that you might think is helpful, once you will deal with temperatures and voltages, and different frequencies for system buses.
this other is about how the voltage influences the cpu, and why and when you need it to be modified.
as for how high you can get yours, this is something you have to find out on your own. this depends on the other components in your system like the pci devices etc, and the current temperatures of your CPU and chipset.
hope this helps!