Main requirements to implement IAAS are as follows:

Operating System (OS): We need an OS to support hypervisor in IaaS. We can

use open source OS like Linux for this purpose.

Networking: We have to define and implement networking topology for IaaS

implementation. We can use public or private network for this.

Cloud Model: We have to select the right cloud model for implementing IaaS

strategy. It can be SaaS, PaaS or CaaS.

https://www.knowledgepowerhouse.com/what-are-the-requirements-for-implementing-iaas-strategy-in-cloud/867