Hi Paul,
Usually there are multiple plans available for Intune and you can select the best that is applicable and features that will be used in your organization, I will suggest you start with a trial licenses and see how that will help and what features are required in your Org - https://www.microsoft.com/en-gb/security/business/microsoft-intune-pricing?rtc=1
https://learn.microsoft.com/en-us/mem/intune/fundamentals/licenses
Hope this helps.
JS
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