A blueprint for new owners

Appoint new Head Coach with agreed objectives.
Share those objectives with the fans.
Allow the new Head Coach to assess squad and decide on whom he wants to retain. Also ask Head Coach whom he wants to exit.
Let Head Coach tell you what new players he needs
Let players know, ensure all that Head Coach wants to retain, want to stay.
Start acquisition process for new players.
Start exiting the exit players....permanently.
Keep fans updated of progress, with direct communication.

It's not hard.