Um, start by clicking service desk in the menu? If it's not there, then you need to install it... For setting up users and so-on, start with https://confluence.atlassian.com/display/JIRA/Managing+Project+Permissions Service Desk does change the way that works for Service Desk projects, but you need to understand the basics of permissions before you can worry about service desk.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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