Hey guys! I have a few stories ideas, but I'm not sure which one will succeed and which one I should begin with. Im in the mood to write stories and don't want that my ideas will be gone. So here is a few ideas for my stories!

1:

A Princess had a good life, until she is possessed by a unknown wiccan. Her family search help by a familiar person and they are trying to save her.

2:

A young police officer have a mission. That's is to protect a school that will be terrorized. As undercover she goes as a teacher and must find out who is behind this.

3:

It's about a girl that writes about her life in a diary. She have many brothers (not sure about numbers) and she lives in a quiet village. She has also two friends and she have a very busy life.

That's the three stories I have now in mind. So how which one of the three I should write?