For project planning, it's important to understand the scope of what it takes to deploy a product, and even more so if you are implementing multiple products at the same time. To help gauge resources needed, duration, level of effort, etc., ServiceNow provides the following scoping guides:

Customer Service Management

Advanced Work Assignment for CSM

Case Management

Communities

Customer Data Management

Industry Data Models

Outsourced Customer Service

Playbooks for CSM

Workspaces in CSM