A call to the program on the afternoon of the match, usually to the program sec, is a step in the right direction I think. It shows you are excited about matching there and appreciate being a part of the program. Usually, other residents, attendings or the chair will call you within a few days of the match.
As for relocating, this is highly variable and probably depends from place to place. Some programs, especially those in high $ rent areas, have some subsidized housing for residents. Other places have realty companies that they work with who will contact you about relocating. Most people I have known call the residents and ask them and then come out to the area, do some research and look around at what's available. More senior residents, especially the class immediately ahead of you might have a better handle on their experience and be of assistance.
Hope this helps.