Cloud migration
Public guidance recommends describing the workload, mapping it to a service/package, consulting the team and rolling out in stages. The detailed plan depends on the workload.
Preparation
Describe workload, traffic, databases, capacity, backup/recovery requirements and operating goals before choosing a configuration.
Rollout
Migration can be split by environment or workload to reduce risk. Specific cut-over timing, RPO/RTO and rollback plans are not publicly specified universally.