if you were to write a book, what would it be about?

i have thought a lot about writing a book, well a children's book specifically. i have ideas for the characters already, but i haven't thought (or dreamt) of a good storyline. the characters are basically animals that live in my yard. i was thinking of the adventures of the animals on sunnyside drive (or something like that). since, i was little i would name all of the animals in the yard. the main characters are george and gladys, two mallard ducks. then there's big bunny, anthony the cardinal and lenore the squirrel. there would also be a little girl who lives in the house named may. (*winkwink*) i need to start doing character sketches, but i still don't have a story outline. one day i'll get there.