Arduino controlled single power outlet.

Hello, im trying to make a single controlled outlet with Arduino UNO r3 project, and remotely control it with the remote and IR receiver the kit comes with. Making the IR setup is fairly easy, but i really dont know where to start with the outlet.
I have a cut off cable with a plug on the other end, and a little outlet i had laying around.
Can anyone give me a heads up on how to use the relay to control the outlet (on/off with remote)?

What relay?

All in all, this really does not sound like a good basis to mess with mains voltage. Don't do it.

Take a look at the power switch tail. It encapsulates the high voltage switching for you.