Actually, it would have been better to start a new topic but not to worry!
Heres a few pointers for installing the CPU in the new board.
1. When you go to choose a mobo, make sure that it fully supports your CPU. This doesn't just mean the speed of the CPU, you must make sure that the CPU kernel is also supported. (For example, with Athlons, the kernel might be Barton, Thoroughbred, Palomino etc). Check with the manufacturers website first.
2. Make sure obviously that your RAM is also supported.
3. When you come to make the switch, wear a static strap & strip out the components & motherboard from the case
4. Remove the CPU & heatsink/fan assembly. Place in cpu in static bag. Clean the old thermal compound off of the heatsink & CPU. Be very careful not to scratch the surface of the cpu. Use a special anti-static cloth or cleanser to clean it, don't use anything abrasive.
5. Place the new mobo on a non-conductive surface (eg Place it on the static bag it came in, on top of a table). Follow the instructions in the mobo manual for inserting the cpu. Place a pea sized amount of a good quality thermal paste (such as artic silver) to the centre of the cpu & spread it so it covers the die of the cpu with a thin film of paste. Replace the heatsink/fan. Check the manual for the correct orientation of the heatsink & instructions for fitting it.
6. Check the mobo manual for any jumper configuration thats need to be set on the board.
7. Install the RAM modules.
8. Place mobo in case & make sure the spacers in the back of the case line up with the holes on the mobo. If there are any holes that don't have a spacer behind them, then add a new spacer to the case. If there are spacers that don't line up with holes on the mobo, then remove them from the case.
9. screw the mobo in place & insert the graphics card & connect the PSU & the front panel connectors (ie soft power switch, speaker, reset etc) to the mobo.
10. Connect the monitor & keyboard & make sure the system boots to the POST screen.
11. If all is OK, connect up the hard drives/CDROM/floppy etc.
Be aware that you may need to do a fresh install of windows. Either way, I wouldn't add all the PCI cards back in at once. Its better to replace them one by one, making sure each one is installed OK in windows before moving on the next one.