You have a couple options available to you depending how involved you want to get. The simplest way is to use a direct duplicating film like
http://www.ultrafineonline.com/ulcotodufi.html It is very simple to use but the contrast controls are not great, basically you will get the same contrast that your original has.
If you need to change the contrast, you can reversal process using a lith film like Arista lith film. The reversal process can lower or raise the contrast of the negative depending on your needs. It is a bit more involved and has more testing to arrive at the end result but allows far more control of the final density of the negative. Here's a tutorial
http://unblinkingeye.com/Articles/NbyR/nbyr.html
Both ways work fine IMO and are relatively cheap to experiment with. Give it a try and report back...
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