Hi Laurie!
Thank you for visiting the Moms Panel!
You will have a wonderful breakfast at Chef Mickey's - congratulations on securing your reservation!
Disney transportation starts operating approximately 60 minutes before theme park opening, so using the buses on this occasion will not give you enough time to travel to your dining reservation.
However, there will be buses running for those attending early character dining. Disney Transportation operates special buses to take guests to their character breakfast reservations. You will need to speak with your Front Desk to confirm what time you should be waiting for your bus. If you are waiting more than 20 minutes for your bus, you can call the Bus Operation Center directly at 407 824 7092 and tell them you need an immediate bus for character dining, and that you have been waiting for 20 minutes.
Enjoy your character dining!, and if you have any other questions please come back and ask me - I would be happy to help you plan your magical vacation.