How to wipe/reset my MacBook Pro?

I wanted to restart and completely wipe my MacBook Pro (MD101). I also searched on the internet but couldn't find anything, and I just wanted to be sure whether I was doing the right thing. I have no disk because when I brought my MacBook in store everything was already installed. It would be great if you could tell me how to! Thank you :-) My operating system is OS X Mavericks.

Message was edited by: naina-