Quoting Whoahbabyy:" gotchya... i googled more too how the hell do you do that lol thats kinda what im hoping to get"
Do you know what type of lens you have? I haven't done it yet so I still need to try it out. If you want the background black you would need some type of black material to use as the background. Here is a little something on of the photography mommas told me to try and help me out, I am not sure if you will understand it all.:
Depth of field is caused by several things. Your aperture, your focal length, your distance to the subject, your distance FROM the background. The wider your aperture, the more uniform your circles will be as well. You basically want to shoot at the widest aperture you can while still keeping your subject in focus. The further the lights are from your subject, the better they will blur. A longer focal length will also produce more compression. The closer your lights are together, the better it looks as well. I experimented with it last year and I still only had a cropped frame and I found I could only get decent tight headshots, all the full body shots didn't have enough blur.
And here is something I found on pinterest: