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I understand that you are looking for a comprehensive solution to manage roles, licenses, and subscriptions within your SaaS product.
User Management: To add, edit, and remove users in Microsoft Entra ID (formerly Azure AD), the least privileged role you need is the User Administrator role1. This role allows administrators to manage user accounts, including creating, updating, and deleting users.
Role-Based Access Control (RBAC): Assign roles to groups rather than individual users. This simplifies management and ensures consistency.
Utilize Privileged Identity Management (PIM) to provide just-in-time privileged access, reducing the risk of misuse
Subscription Plans: please follow the below articles https://techcommunity.microsoft.com/t5/startups-at-microsoft/azure-subscriptions-made-simple-essential-tips-for-startup/ba-p/3857418
https://learn.microsoft.com/en-us/azure/cost-management-billing/understand/plan-manage-costs
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Akhilesh.
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