I am roughly following this tutorial and have created a kernel.img.
Do you still have the SD card with the original Raspbian image on it from when you where testing the hardware above? Great. So you already have a SD card with a boot partition and the required files. If not then download one of the original raspberry boot images and copy them to the SD card.
I do not have the files on my SD card so my question is, where do I find all of the other files in the "original raspberry boot image"?