maybe you can elaborate more detail so all the sifus will be easier to assist you..

1.extend back of the kitchen? (depends on alot of thing, size, material being used, and what exactly do you want?)

2.install new kitchen cabinet (variety, really wide range from the cheapest one to the most expensive, but recently always hear this legendkitchen.com from ads)

5. depends on the tile and the size of your car porch.