All of the pictures and images that I use, I have either taken myself or I got from websites that have free for commercial use images such as: https://pixabay.com/images
I use Inkarnate to make the maps: http://www.inkarnate.com
I used MTG Cardmaker to create the information cards on each character: http://www.mtgcardsmith.com
I used LunaPic to edit some of the pictures that I got from Pixabay: www3.lunapic.com
I hope that’s helpful to you! And if you have any specific questions about my sources ask me in the comments section.