Certainly not a comprehensive list, but it will get you started:

Books:
Color for Painters by Al Gury
Oil Painter's Solution Book:  Landscapes by Elizabeth Tolley
​Vibrant Watercolors by Dan Burt

Artists:
Walt Bartman, Yellow Barn Studio, Goldfinch Studio, Griffin Art Studio, and Summer Duck Studio on the Chesapeake Bay (seriously, just go!)
Hai ou Hou, Chesapeake Fine Art Studio (I haven't had the honor to take one of her classes yet, but have met her at the Wekiva Island plein air) 
Stewart White, beautiful watercolor landscapes and more!  Have had the privilege to see his work at Plein Air Easton
Wolf Kahn, Based on the pictures of this artist's process, I'm going to need a bigger studio...

Websites for supplies:
Artwork Essentials
ASWexpress
Open Box
Canvas Panels
Utrecht Art
Guerilla Painter
Dick Blick
Jerry's

Website to create your online gallery:
DailyPaintWorks

Plein Air Magazine--Get a free ebook with 240 tips to improve your plein air paintings!