First, define a filter that returns the list of all the issues you want (I suspect you can be as simple as "no assignee"). Save it with a sensible name, and you probably want to share it
Second, go to your dashboard, add a new one (share that too probably) and add the gadgets you need to it. I'd start with a simple one like the "filter statistics", because you can give that your filter and another field such as "project" and it will give you simple breakdowns. (For your filter and hte project field I suggested, it'll tell you how many unassigned issues there are per project, and the graphs will give you links to searches for each project). Then you can move on to other gadgets like "list of issues" or the "2d filter stats" (very powerful once you get a good understanding of it)
Please take a look at the documentation first, it should help you with understanding dashboards and how to use them, also take a look at how filters work and how you can use them in combination with your dashboard gadgets :
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