Hello, Gil
Welcome to the community
1- You can change the colors, but not automatically, but you can select this options on card covers that will help you.
https://www.atlassian.com/blog/trello/card-covers-and-colors#:~:text=How%20to%20add%20a%20full%2Dsplash%20card%20color%20to%20your,as%20seen%20on%20the%20right).
2- This can probably be resolved with this
https://www.atlassian.com/blog/trello/custom-due-date-reminders
3- If you are a watcher on the card/board you should receive the notifications.
4- What reports do you specifically need?
Kind Regards
Alisson
Trello Team
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