http://www.deadline.com/2014/07/sons-of-anarchy-comic-con-fx-kurt-sutter-bravta-book-charlie-hunnam/

“I think spinoffs work well on procedural dramas, which this clearly is not,” Kurt Sutter said at Comic-Con. PLUS: A “Sons of Anarchy” novel (http://mashable.com/2014/07/27/sons-of-anarchy-comic-con-panel/) is coming soon.
Read more at http://www.hitfix.com/tv-tattle#tf4IzHHZtZS8eeOU.99

A prequel will work and it's a much better idea than a spin-off. I can't see any of those characters getting their own show.