Writing a children's book

Lindsay • Answer to no one but God.
So the other day my s.o. aunt came over to our house. I happened to have some of my old artwork sitting around and I was working on painting a picture for my daughters class. So the aunt comes to me and says God just spoke to her and said I need to write and illustrate children's books. I've come up with a lot of book themes but I don't have to motivation to actually write anything. Writers block is the worst. Any advice?!