Found oil in a weird spot.

[Marv17]

So tonight I was going to Walmart to get some essentials for myself. And when i started my car up i muted the radio for some odd reason and my window was down. I started to hear this weird noise and felt something out of the ordinary. It sounded as if the car was spuddering? or something. i mean it was going but not as if all 4 cylinders were right. its weird to explain anyway. i went to Walmart and paid close attention how my motor was running. the sound and feeling went away by the time i got home for the 8 mile drive, there and back. I got my tools out and check the spark plugs. One had OIL!! I know that isn't normal what so ever. Could this be the source of my issue?? from what i was hearing and feeling earlier??

so how do i fix the "oil leakage"?? do i need new gaskets or something??? what parts are needed?? Help please!