The question explains most of it I just want to know where and how to receive permission to build it.
You need to apply for a permit. Here's a link for Prince George's County that explains the process:
If your property is subject to an HOA, then you first have to obtain permission from your HOA board. that process is described in the HOA documents you received when you bought the property, or you can contact your HOA board for more information.
Assuming you are located in the City of Hyattsville, you will likely need a permit from the City. I'd try there first and they will help you with the County permit.
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