OBW blocks consist of 6 triangular pieces. The high point of the triangle come to the center. The 2 bias edges are inside the hex and the straight of grain edge is on the outside. Sew three triangles together to make one half unit. Sew the other 3 together to make another half unit. Pin these two units together. Make all blocks.
Hopefully someone else will jump in because I really cant put into words how to arrange the blocks. But they are arranged to sew together in rows. I think if you look on youtube and type in OBW or One Block Wonder you will come up with some tutorials.