Hi Exdecora...the first thing you need to find out is what socket mount your motherboard (mobo) has. The reason is this: any CPU that you can use must mount to the mother board, and the socket number is what will determine that. Without that you can not go any further.
If the computer is an OEM (retail type, off-the-shelf computer) please post the make and model number, and hopefully we can find what mobo it uses and what socket it is.
General information: the computer will get power to the fans, etc. but without the CPU it is a body without a brain. Nothing will show on your monitor and there will be no recognition of a mouse or keyboard. Most likely you will need to scan Ebay for many of the parts (including the CPU) and hopefully the prices will not be too bad. Unfortunately, older legacy hardware is priced high because it is not manufactured any more, but until we know exactly what you have there is no way of telling.