First time having manual brakes, are mine bad?

Ok got lost in the OP with multiple posts. Disc front drum back. Got it. Don’t beat me up for trying to help.

having said that simple imo. Back brakes most likely not working. Check pressure. Many posts have made reference to smaller MC better. I would still Jack the car up and try to turn the wheel with brakes applied as a simple test if you don’t have a gauge.
Good luck- done