I followed your advice by extruding the lower two things that are sticking out there, but it's about the selected thing. I want those subdiversions out, one whole piece, so I can extrude the left face to make the sharp piece of the blade broader.
well that's not really a good idea... best bet is to select all of the faces of the one side, and then extrude with 'keep faces together' checked in the menu towards the bottom. then you can extrude like you want.
at the same time (although not recommended) you can go into edge mode, highlight all the edges you don't want, and choose delete edge. i still recommend doing the first thing i suggested.