Start with the problem
Do you need better reception, more visibility, a deterrent, access control or all of these? Defining the problem makes product selection easier.
Consider the building
Roof type, wall construction, ceiling space, cable routes and internet location can all affect the installation.
Think about future needs
A slightly larger NVR, spare network ports or extra cabling can make expansion easier later.
Ask for a clear handover
Make sure you know how to use the app, playback, alarm arming and basic troubleshooting steps.
Need site-specific advice?
Photos, a rough floor plan, existing equipment details and a short explanation of the issue are usually enough to begin a practical discussion.