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One of the best sites I know for information on resin casting is actually a site that sells plaster cast molds - Hirst Arts. The Hirst Arts tutorial on resin casting is excellent though and has all of the basic info you need to get started:

Mold Making: http://www.hirstarts.com/moldmake/moldmaking.html
Casting in Resin: http://www.hirstarts.com/casting/plastic.html

Starship modelers website also has some nice articles on the subject:

Basics for beginners: http://www.starshipmodeler.com/basics/jc_molds.htm
Full Primer: http://www.starshipmodeler.com/projects/jw_resin.htm

Here's a few more articles from some other sites that you might find helpful:
http://www.instructables.com/id/Two-Part-Silicone-Casting/
http://www.thelastalliance.com/index.php?pid=disparticle&catid=4&subid=25&artilceid=3212
http://www.aeroscale.co.uk/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=1564
http://ultrawerke.blogspot.com/2007/02/resin-castig-tutorial-part-i.html

I've done some resin casts before and it really isn't as hard as it might seem, and you can get some excellent results for really small parts.

Keith