1) You will have a lot of difficulty working with a linux kernel build on windows. I know it is possible, but I seriously doubt it's worth the trouble.
2) Currently we have a debian image, but support is very limited. Do not expect to jump right into this board like a raspberry pi or similar, there is still a lot of work to be done.
3) Sure, some components of the build architecture will be well documented, however, it will be difficult to work with the build environment without at least some basic understanding of how the linux kernel boots etc.