Why should there be a book for Gambling websites alone ? It is pretty much a website like there are thousands of others.
If at all there should be a book then it should be on how to create a dynamic website which I think there already is or at least there are courses which offer these.
Any web developer or a full stack developer could do this job for you and if you are planning on to create such a site by yourself then you must learn the whole web development course yourself which is pretty much time consuming.