Welcome to the forums.
If you look to the top of the web page you will see an area called CP (Character Profile). If you enter your profile and insert your system specifications then it will be easier and better for those who help to be able to take the hardware specifications into account.
For a small overclock you will not need to change the voltages. This board supports a 1066fsb so you are to be commended on your choice of processor and motherboard. This is because you should be able to just move your fsb from 200 to 266 and not make any other changes to your system to achieve an overclock of 1GHz.
Here's how it works. The processor you have was fabbed out for a 1066fsb. Rather than make two different fabs Intel took the 63x series and the EE series on the same fab for this processor. Thus your processor was spec'd for a 1066fsb. Intel just downgraded the fsb to 800 on your processor but it was created for the 1066 so the move does NOT take this processor out of it's spec abilities. Intel just "Governed" the bus speed.
With your motherboard, you can remove the "Govern" of the processor and raise your fsb to the spec. This is why you do not have to make any voltage changes but if you were to overclock from 200 - 265 then you would after ~230MHz very likely have to raise the voltages as this is an out of spec fsb raise.
Look for "External Clock" and set it to 266. If this does not work, then shut the system down for ~30s. Hold the insert key down and restart your system. Enter the BIOS and reset to 200MHz and post here the inability and you can be shown how to do an out of spec overclock.
However, I do not know what you are using for a CPU cooler and such a raise would do well with a good aftermarket cooler. As a matter of a fact, any Prescott would do well with an aftermarket cooler.