I have this sub woofer in the picture, but the only wire coming out of it is just like speaker wire wich you can see me holding... how would i hook this up too my receiver???

Red = +, Black = -?
It's just like a normal speaker, but you will want to feed a filtered signal to it (only the sub frequencies).
You'll need a different amp for it from your main speakers.

im sorry but i dont understand... id have to buy an amp or something??

Depends; most likely, yeah. If you have a receiver, it could:
1)Have an amp built in for a sub, you plug the sub in here.
2)Have a sub line out, you would plug in an amp for a sub here.
3)Have nothing to do with a sub, like mine, you will have to -build a subwoofer processor, and -connect an amp to the processor, and then the sub to the amp.

Basically this sub processor mixes the L and R signals, and then filters out the high frequencies, so you are left with a signal perfect for the sub.

At least 150-200 watts is what I would recommend for a good sub-amp.

Sub-Woofer Controller
Audio Power Amplifier
300 Watt Subwoofer Power Amplifier

I realise that you probably don't want to DIY all that, so you may be able to buy a processor and an amp online...as to where to look, or which to get, your guess is as good as mine....

Thanks for the help i will get my tech freind too come over and see what he thinks i need too do lol