Teraflops?

[MetalMilitia]

It would take some time to explain but you basically have to reaserach... FSB, Voltages and find out what core your processor has (CPUz should be able to tell you) .
Adjust the clock settings in your BIOS but do it incrementally at about 5-10 mhz then test, and by test i mean leave it running superPI for quite a while.
Monitor temperatures with a program such as speedfan and make sure the core temp doesn't go far over 60 under full load.

I havent ever used a P4 motherboard or processor (for overclockign anyway) so i dont know if they generally have PCI lock so AGP and PCI speeds are not automatically changed when you adjust the FSB but if its a decent motherboard it shoudl do. (running AGP at over 70mhz is likely to fubar someting)

Overclocking memory is done in the bios also but depending on the quality of the RAM results can vary. Ideally you would run it 1:1 with the FSB but i dunno how possible that is on a P4.

Raize can probably give you a better explanation, im too lazy and my motherboard sucks to much to OC my processor by more than a few MHz so i dont have much expierence.