If you are staying at CS, I'd skip eating breakfast out of WDW. You will spend a bunch of time in traffic, plus get in with the other breakfast eaters. Then you will need to park your car and take the shuttle to the TTC. So unless you get up to eat breakfast at 5:30AM, I'd eat in the room, in the food court or in the parks. You might be able to do McDonald's just down the road from BB, but any other will be a time breaker. If you want to eat lunch outside the park, that would be more doable to me.
Don't plan on showing up to the MK at 10:30 unless you plan to spend the rest of the day in lines. Do it early and avoid the lines.