Whats the cheapest microphone and voluble equipment I can buy for my leash?

I don't know what a standard microphone comes with and what equipment you need to work it (cables, PA, etc.). Can someone update me what equipment I need to buy to sing for our band contained by my basement?
"> If you are not planning on recording, what you want is a PA system.

A PA system will have:

mixer
amplifier
speakers
mics
mic cables
speaker cable
mic stands
speaker stands

They do sell complete packages:

http://www.zzounds.com/item--ZZOPA5

If you don't have abundantly of money, just start off next to what you can afford. Check pawn shops and Craigs list within the USA for used equipment.

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