Illustration Websites, Publications + Online Communities:
Pricing + Business Articles
and Books:
Business and Legal Forms for Illustrators by Tad Crawford (book)
Graphic Artist's Guild Handbook of Pricing and Ethical Guidelines (book)
"How Much Should You Charge For Design Work?" by Jessica Hische
Digital Tools for Illustrators:
Astropad
Adobe Photoshop Sketch
Adobe Illustrator Draw
Autodesk Graphic
Pixelmator
Procreate