Choose one audience and one important task.
Describe the first user in concrete terms and the job they need to complete. Avoid trying to serve several unrelated audiences at launch. A scheduling product for a small service team and one for a large hospital have very different requirements.
Write the complete first journey.
Map how a user starts, reaches the main action and knows it worked. Include empty states, invalid input and recovery from mistakes. Remove peripheral features before removing the reliability of the core workflow.
Identify what can be done manually.
An early onboarding step or internal report may be handled manually while you learn. Make that responsibility explicit and check that the workload is feasible. Do not hide manual work behind promises of capabilities the product does not have.
Define the release decision.
Write observable acceptance criteria for the core journey, data access and operational readiness. Agree on who can approve the release. Security and recovery needs should match the data and risks even when the feature set is small.
Decide what you want to learn.
After launch, examine whether users can finish the main task and why they stop. Combine usage signals with direct conversations. Use those findings to prioritize the next release instead of automatically building everything left out of the first one.