Heat register locations when finishing a basement

[signcrafter]

The house we bought a couple years ago came with a half azz finished basement. I'm going to start gutting half of it in a couple weeks and start redoing it. In the larger "living room" area there are two hear registers in the ceiling. I'm going to be framing off a corner of that room to make an extra bedroom, it already has an egress window. Going to be doing wood stud walls with drywall and a suspended ceiling. I don't know much about heating and cooling layout so looking for some advice on the best way to run the heat duct. Could keep it in the ceiling or run duct over to a wall and use the stud cavity of interior wall as heat duct and put a register on the wall. Where would the best location be for the heat register? The exterior concrete walls have white foam board and the stud wall has fiberglass insulation if that matters as to register location. I don't think there are any cold air returns in the basement that I remember, not there for the next week but trying to do some homework to be able to start right when I get there. But it stays pretty even as the upstairs temperature wise.

 

[The Cobbler]

ideally, in my opinion, heat vents should be nearer to any windows . ceiling would probably be my choice