Set them up however you want.

Journals
-Mark them with [Journal] or [J] in the title.
-One thread per character OR Set it up with one page per character.
Multi-character journal and Single character journal.
-Do not post in someone else's thread with out permission.

You must include this information:
-Neighborhood name.
-Bells and all items each Character living there currently has.
-Neighbors.
-Trees, flowers and red turnips planted.
-RolePlays.

Plots
-Mark them with [Plot] ot [P] in the title.