The passenger door handle can be changed easy if spring is broken.
For the drivers door lock, you'll need to take the door panel off, maybe the linkage has come off, though if it has remote central locking, I have known people to take the link between the door lock(exterior) and the lock mechanism off!!, no I can't see why either but was also done on my car when I got it, so might just be a easy fix by popping link back on.
As to the window, I would prise out switch first to see if there is power going into, and out the switch for this window, then if needed, as likely will be remove the door panel, could be anything from broken wire to knackered motor, to snapped cable, which is amazingly common.
If you need focus parts I can recommend FOCUS/MONDEOPART 01603 866999, they do mail order, I was there looking for a rear door focus lecky set up, but seems very rare even on the ghia's.
tabetha