Once in a while I provide links to vendor or sponsored posts. This one, sponsored by CDW gets you a white paper written by CIO magazine, a respectable, trusted source for "best practices" information.
CDW is an infrastructure hardware and software supplier, again trusted and reliable. I have used them for years and found them to be a good resource with reasonable pricing, especially for complex software licensing.
If you are considering a cloud migration, sorting our the differences between SaaS, PaaS, and IaaS is an important first step.
SaaS - Software as a Service
PaaS - Platform as a Service
IaaS - Infrastructure as a Service
Thanks to CIO
Cloud Migration Options: CIO White Paper