Load raster images using wms

[K S]

I need to load raster images from a site on the internet. I believe that i need to find a wms server on the internet from which i can load raster images to my mapserver.How could this be possible? I have read documentation about it and I wonder how can i find information in order to fill this data to my map file
(example):

CONNECTION "http://www2.dmsolutions.ca/cgi-bin/mswms_gmap?"
CONNECTIONTYPE WMS
  METADATA
    "wms_srs"             "EPSG:42304"
    "wms_name"            "prov_bound"
    "wms_server_version"  "1.1.1"
    "wms_format"          "image/gif"
  END

 		
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