How to file MD/PA taxes with new marriage/moving

Hi all,

I'm quite new to filing taxes and would appreciate help with a situation that is complex to me.

Right now, I am living in PA and working in MD and have my withholdings set for PA. My partner is living in NY and will start working in MD in the next couple months (he does not have any NY income this fiscal year). We are planning on getting married around mid-September and will both move down to MD together around that time as well. I will update my address with my employer to the MD address.

We would like to file MFJ for federal taxes but are unsure how to best proceed with state taxes across MD/PA and possibly NY? I sincerely appreciate any help I can get with this!