Good video (17 min.) with step by step instruction on making your own nets. Nets may be used for many things besides fishing, such as storage, plant supports, etc.
You will need a few tools and the video shows these. They can be purchased or made by hand.
https://www.youtube.com/watch?v=I8jGU5U4u2Q&feature=youtu.beThe author shows how to start and build a typical net.