Hi,
To install Dynamics 365 Marketing, you need to first purchase a base license. Which base license you choose depends on whether you already have a qualifying Dynamics 365 application. If you have Dynamics 365 Sales, Dynamics 365 Customer Service, Dynamics 365 Field Service, Dynamics 365 Supply Chain Management, Dynamics 365 Finance, or Dynamics 365 Commerce with 10 or more users, you can purchase the reduced price "attach" license. Otherwise, you will need to purchase a standard Dynamics 365 Marketing license.
Once you have a core license, you can purchase additional production or non-production instances, as detailed below. You can also purchase additional contact or interaction packs. More information: Dynamics 365 Marketing pricing.
You can contact the sales person in the above page for more details.
