Dean,
Xray film is much like any other analog photographic material in that is being replaced in the working world with digital versions. The need for electronically sharable medical files is increasing the rate at which this is happening. Still, while it lasts it's a good, inexpensive way to play around with large format. A lot has been written in this forum about using Xray film, and I would suggest a search for threads on the subject would be more useful than anything I could tell you here. Contact printing is pretty straightforward, given a dark room, a controllable light source, some way to keep the negative and receiver in contact (plate glass works well) and the chemistry to process the paper–an enlarger is not your only choice here, but the options are, again, too broad to review in one post.

Paper negatives are also something you might want to try. Good luck.