Have you contacted a kitchen designer?

Is this for a new house? How do you cook? How many cooks will there be? What do you cook? Why is it 20' x 12'? Where is the kitchen located in relation to the dining room? Where is the kitchen located in relation to the living room? Where is the kitchen located in relation to the garage? Where is the kitchen located in relation to the main entry to the house? What style is the house? Is it a kosher kitchen? What appliances do you want? How large do you want the sink?

Perhaps you should hire a local kitchen designer.

Show some pictures and it will be easier to advise

We are attaching the garage by a breezeway/porch on the left side of the house.

You need a Kitchen Designer. ASAP. Not a cabinet seller. And a big budget at least twice that of a standard kitchen. That’s twice the size of the average kitchen. Bigger isn’t better. It’s usually worse, without thoughtful, intensive, and professional design. But bigger does cost more!