I apologize, I do not have answers for 1, 2, 4, or 5 of your question, but for figuring out who to ask about character ideas:
If your questions are based in general lore, you can ask either myself or DM Boruto for lore clarifications. If you have any specific questions that DM Boruto cannot answer, I can almost certainly answer them for you.
If you have questions based on either of the factions specifically, you can ask either DM Ayame [for Sunagakure-related questions], or DM Obito [for Konohagakure-related questions].
For any other questions you have, I would try to get into contact with either DM Hiruzen, or Sarada Uchiha, on the forums. Hopefully this helped!