There's a few different ways to go about this; you could create a cube with several divisions in each axis, then roughly scale it to the rights size before going in and moving vertices.
You could also draw a cross-section of it using cv or ep curve tool, before creating a few copies along the length of the right scale, that you then loft a surface with.
You could also start out by drawing a polygon plane, orienting it and then extruding an edge.
Ways, ways. There's just so many ways.
Here's a link to a tute that's actually made for 3dsmax, but works okay with maya.
There's a couple of differences here and there, but nothing too major.
It's Joan of Arc's sword btw.