I think you might have your terminology mixed up.
A wide angle lens would generally be something that's 24mm or wider on a full frame (35mm) sensor, the 28mm on your camera is equivilent to 42mm.
You create a wide angle shot by using a wide angle lens, unless you mean a panorama which is taken by stitching multiple images together.
Aperture controls the amount of light let into the camera, as well as the depth of field.