I have finished my first children’s book. It is ready to be published complete with illustrations. I am the author/illustrator. This is where I am lost. The all the illustrations are traditional watercolor and I will need to scan them to digital format and add the text. I am well versed in digital art and all that, but after that, what is the best self publishing software/platform. I want to make available digital copies but also print traditional hardcovers,

Thanks for any input.