servicedesk is an add-on for Jira, so you need a licensed Jira Installation and then you have to buy service desk licences for your agents.
There is a FAQ here: https://confluence.atlassian.com/purchasing/new-pricing-model-for-jira-service-desk-2-0-faq-621314223.html#NewpricingmodelforJIRAServiceDesk2.0FAQ-WhatisthenewpricingmodelforJIRAServiceDesk2.0?
If you need more information, contact Atlassian people here: https://www.atlassian.com/company/contact
Hello Atlassian Community! I'm Teresa, the Product Marketing Manager for Jira Service Desk Server at Atlassian. I'm excited to announce two exciting releases for Jira Service De...
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