@Kimmykat14 personally, i love warrior cats. But as for ideas, just start out with a little introduction, and maybe branch of ideas of what could happen to get to that part of the story. I'm bad at giving advice, but if this helps, use some interesting part that you liked from the story (my personal favorite is Bluestar and Firestar's life stories) just use any part, and try to make your own story based on that..? But don't directly copy, make it fun for you to write! If you don't have fun, there is no use in writing it. And it's okay to rewrite, as well, if you don't like it. Use characters you would like to be, or are already in the story! Hope i helped at least a little bit :3