Welcome to VA!
VA has reciprocity with DC so DC may be a non issue depending your situation, check here to start
https://www.tax.virginia.gov/reciprocity#:~:text=Virginia%20Residents%20who%3A,Columbia%20Unincorpor...
DC aside, you would need to file part year state returns for PA and VA and during that process TT will ask you to assign your Federal income to either state, usually that's just done by where you were resident when that income was earned, if you have a W2 for the job in PA and W2 for the job in VA then that is easy to assign, for other 1099 investment income you have to figure out the split and input to the state programs. The part year state returns figure out how to annualize/pro-rata your state deductions etc.
