Jacob,
Unfortunately there is no one single documentation that ties this together that will come from IBM. The way I look at it there are 3 many steps:
1. Install of OpenShift
2. Install MAS prerequisites
3. Install Manage or other MAS Suite applications (e.g Health, Predict, etc).
For OpenShift the documentation is available from the RedHat site and goes into great detail depending what platform (AWS, Azure, IBM, on-premise with vSphere) https://access.redhat.com/documentation/en-us/openshift_container_platform/4.8/html/installing/index.
Installation of MAS is outlined with the link Craig provided
https://www.ibm.com/docs/en/mas-cd/continuous-delivery. Lastly if you are trying to install Manage as an example, then the documentation is here https://www.ibm.com/docs/en/mas-cd/continuous-delivery?topic=a-maximo-manage.
Mike