Nice skyline iv always wanted one for general use,
Graig i can write you a quick breif on how i done mine.
Ok so you have your bundle open it up, The first thing your going to do is carefully as possible dismantle your old pc ( unpluged from the wall then inside the case unplug all the power cables attached to components. Secondly remove the cd/dvd IDE cables form the case keep your hard drive in there just unscrew the mother board with a small screw driver.
Once you got that case empty apart from the PSU (power supply unit) the cd/dvd drive and your hard drive, ok now gently handly your new mother board. I would advise cliping the single peice of 2gb ram in first, Put this in the slot closest to the CPU, Then unpack your CPU and fan, now open the cpu bracket take out the CPU cover throw that away

put your cpu in then clip the bracket back down to hold it in place. Now grab the fan that came with the cpu, It will already have Thermal tape on it so no need to worry about that. Gently ease the fan ontop of the CPU make sure you line up the holes for the fan to clip onto the mother board. Make sure all 4 of the little clips pop out the other side of the mother board so the fan is secure. Now your ready to screw the mother board in your case. Once you have carefully done that, Attach the SATA cable in the slot with 1 above it. connect that to your hard drive.
Now connect your Dvd rom back up to the mother board. Ok so the final thing is to connect the power leads back up. To start with find the little ATX i think its called lead that goes onto the mother board quite close to the CPU. Then attach your main motherboard 24 pin power cable also to the motherboard, connect the sata power lead to your hard drive.
Now take the manual out of the box, Look for the page which explains which pins on the mother board do. Find where you connect your Power button and connect that, You may also have sound and usb slot son the fornt of your case again look in the manual it will tell you exactly where to put it.
Now boot it up and install the drivers on the cd.
I think that just about covers it mate if theres anything i missed and you get stuck on give me a shout, will reply asap.
Grats on learning how to build a pc!