ok, well there are a lot of different organisations, some quite specialised, some offer accommodation, some advice
sooo instead of listing organisations I will link you to this website
http://www.homelessuk.org
if you click search all services, you can then choose the area (scotland, then your region) who the services are for, and what service.
It'll give you a list of places / services and then you could google the ones you're interested in for the organisation website.
good luck - sorry if thats a cop out :P