You can easily change the home page for the current user: https://confluence.atlassian.com/jira064/changing-your-jira-home-page-720416089.html
There doesn't seem to be a way to enforce a home page for other users the way Confluence does.
User Preferences are stored per account, that includes the default dashboard. Let's say one user have 3 dashboards and he/she selected "Dashboard A" on it's current session. The next time he/she opens JIRA, Dashboard A would be the dashboard that will be opened. You cannot control that.
So for this to work, you will have to ask all your users to add the dashboard you just created to their "dashboard" list and make it their "default" (select it one time and don't switch to another dashboard which never happens).
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