This page contains links to instructions for the classical Sonobe module. There also exist literally hundreds of variants: those have their separate pages on my site.
You can find diagrams for folding Sonobe module at Helena Verrill’s site. The page also contains a phototutorial which shows how to make a spiked icosahedron (30 unit assembly) from them.
There are many videotutorials about the Sonobe module. One I think is quite nice is this video by Polygon Origami.