There are a thousand ways to tie a San Juan Worm, but I'm a big advocate of simplicity. Complex and hard to tie files are not in my vocabulary, I just don't want any part of those. Use this as a dropper off of a Mega Prince or Jumping Jack Flash. Tie a bunch of these for the early season.
The Mega Prince:
https://youtu.be/3bouympWmyc
The Jumping Jack Flash
https://youtu.be/T0UCGcQtkRQ