Kenneth Fisher provides musings based on an Azure security document:
It gives you a map on how to manage your security as you move into the cloud. Note: one of the main points is that your on premise security is equally as important and has to be managed with and as a part of your cloud security.
Now if you are like me and want more than just dry reading they also provide a link to a Microsoft Virtual Academy training course called Security in a Cloud-Enabled World that follows this roadmap and provides more detail and guidance.
Read the whole thing.