If you are a dependent, you are a resident of the state in which the person that claims you lives.
If you are a non-dependent, and if you lived more than half the year in DC, you'll have to file as a resident of DC.
Yes, do the non-resident return first, then the resident.
Income other than wages are reported on the resident return, unless earned in a different state, such as a sale of property or rental income.
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