First you'll need to download and run 'Coretemp', which will give you the VID voltage for your processor. It could be anywhere between 1.20v and 1.3250v. This is the minimum required voltage for your processor to operate at 2.4ghz.
Write down or remember this value, it's your starting point.
Then you'll need to find out the timings and voltage required for your sticks of RAM.
The timings may be written on the sticks of memory themselves, or should be in the description of the item on the website you bought it from. I'm running Kinston HyperX 1066mhz stuff which is rated at 2.2v at 5-5-5-15. Yours will no doubt vary unless you have the same RAM.
Now for the BIOS part:
See if you can enter 1.2625v into the CPU voltage section (may round to the nearest value), and enter your RAM timings and voltage. After you read through the images, to overclock simply raise the FSB setting from 266 to something higher. I'd go in steps of 10 or 15, which in the long run will benifit you more, as you are only 10-15 settings from something stable. With that RAM, i'd set the memory to 800mhz (but keep timings and voltage the same) so that you dont overclock youre memory past 1066mhz. You'll notice that all the values for the RAM speed changes as you overclock the FSB, but you should always have a ratio that is under 1066mhz. (and over 1066mhz if you want to overclock the RAM). Doing it this way just excludes the RAM from being the cause of instablility.
Now you need to monitor temps. You've already got coretemp, but there's also Realtemp you can use, as well as various other 3rd party software that can monitor temperatures. On a quad, the cores will pretty much never all be at the same temperature, but should come closer when under stress. To check stability, download 'Prime95' and the 'Intel Burn Test'. On prime, run the Small FFT's test
and also the large FFT test for at least 15-30 minutes after overclocking, checking temperatures as you go. The Intel Burn Test runs for only a short period (default setting anyway), but will make your temps go as high as possible in a very short space of time. If you get any errors in either program, it is likely the overclock isn't completely stable, especially if you get the errors in the first 30 minutes of running Prime.
Should you get an error message, close down and restart. Enter BIOS and press the + key on the CPU voltage and notch it up a step (increments arent massive). With a Q6600 G0 (and on water), you're ok up until 1.50v, but i most certainly wouldnt go any higher for 24/7 usage. As you can see in my picture, i need 1.38v to get 3.0ghz, although my Q6600 is a really bad overclocker and you're lower VID should mean you get a better overclock at a lower CPU voltage. I imagine you'll need around 1.4v-1.450v to get 3.6ghz. If you cant seem to pass the Prime test, notch the northbridge (NB) voltage up one or two steps. Again, you're ok up until around 1.5v, but i wouldnt advise going any higher. Somewhere between 1.3v and 1.4v should be your sweet spot i imagine, although it could even be lower.
This is all you have to do. Keep checking temperatures and checking to see if there are any error messages in Prime. A stable overclock is one that doesnt fail Prime in any of the tests for any sustained period of time.
Another program worth downloading is CPU-Z. Run this and monitor what the CPU voltage reading is when you are running prime. There should be some form of voltage drop from what you set in the BIOS, but it should only be a few notches down from what you set it to. If you feel the drop is more than significant, enable 'Load Line Calibration' in the BIOS and see if that makes it any closer to what you set in the BIOS.
Good luck.
. Here's a screenie