Whats the proper workflow for creating a Windows Store / Windows Phone game ?

What I mean is how similar are they in the development ? Can I do 99% of my work inside the unity editor and not worry about the differences in the two platforms until the end ? Do I need to think about the differences at all or will it all just scale down automatically to the right size for each platform.. Is there anything special that needs to be done before submitting these to the app store? I have only submitted apps to the app store using the standard visual studio way.. IS there any tutorials on the process out there? Anyone else doing Windows phone dev want to chat ? I am punkouter@outlook.com on skype