Marriage, change job, buy a house

I have three primary inquiries regarding my upcoming year's taxes. Firstly, I recently got married, and my husband resides outside of the USA with no intention to move here. I'd like to know how I should go about filing my taxes under these circumstances.

Secondly, I've undergone a change in my employment and relocated from Texas to Mississippi. I'm curious about how this move might affect my tax situation.

Lastly, with the change in my job, I've also purchased my first home and now have a mortgage. I'm interested in understanding what expenses may qualify for deductions at both the state and federal levels in Mississippi.