My age is 13. I want to write a book. Can you please give me a good topic? And some good suggestions for how to write it well? Do you think that I should write it with someone else?

I'm a girl who's a teen. I like cats and dragons and unicorns and did i mention cats and dogs and bunnys and parrots and stuffed animals and horses and more cats and wild animals and art classes and crafts and dolphins and rainbows. Yup. Also, i try to help people in any way i can.