Though we don't have a specific plot for this site, we do have one very specific guideline for plotting:
Keep to your era. When posting, make sure your posts are clearly labeled with your specific era. If your character is alive in more than one era, assume they know nothing of their future self. You can post in more than one era (if your character is alive), but things have to be historically accurate. 17 year old Harry doesn't know he has three kids with Ginny in the future, just like Marauder's Era Dumbledore doesn't know Snape kills him.