1. how much do you know your computer.
2. what is your goal.
3. do you fully understand mem timings, voltages, fsb increases and such.
4. download memtest86 and prime95, and Sandra 2003.
It's better if you know what you want to do instead of asking "how do I overclock", cause another guy was asking how to OC his memory, and 10 people explained the same damn thing until he finally got it.
usually, I start by increasing FSB and loweing multi. I set my mem and CPU to sync, and run memtest86 every 5 mhz increase in my memory. I think your 2400 is at 266 right? So start upping your FSB from 133 to like 140, and then so on. you'll probably hit the max FSB with your CPU before your mem so just set your timings to 2-2-2-5. Up the voltage whenver it becomes unstable.