Note-The reason i don't have a graphics card is it arrived Dead and i sent it back.
www.NewEgg.com Computer parts.
www.Xpcgear.com Computer Accessories.
www.eBay.com Everything else.
NEVER BUILD A COMPUTER ON CARPET. IT CAN SHORT IT OUT.
To begin you will want to gather all of your parts together.
The basic computer is built from:
Motherboard - Make sure the Mobo is compatible with the processor. It provides all of the pathways connections and lines to everything.
Processor - It is like the Human Brain. Everything that goes through your computer goes through the CPU at some point.
Power Supply - A PSU converts the alternating current power from a wall outlet into a direct current power source that the devices within a computer system use. Power supplies also serve to regulate and control the distribution of this power across several voltage levels.
Memory - Random Access Memory, or volatile memory, is used by the system to store data for processing by a computer's central processing unit (CPU)
Disk Drive - Is used for reading and writing Cd's or DVD's.
Hard Drive - Used to store data and operating system.
Operating System - It manages the hardware and software resources of the system.
Computer Case - It houses the whole lot of it. It should already come with fans but you can swap them out for lighted if there not already.
Those are the fundamental things you need for a computer.
Next A little about the Motherboard.