My favorite TrueFire artist is Vicki Genfan. She is one of the most rhythmic and dynamic guitarists I've ever seen. She's got several lessons listed and a pretty good one on 30 strumming patterns. And you can find examples of those at youtube. Good luck...
https://truefire.com/educators/vicki-genfan/e4175
And Vicki's web site if you'd like it...
http://vickigenfan.com