Jollyjasjas, Resin is awesome. It is a 2 part liquid plastic that cures and hardens to a hard plastic finish. Check out this thread http://www.craftster.org/forum/index.php?topic=10667.0
for a huge discussion on it. If you are also looking to jump right in with jewelry, pick up some epoxy resin (1:1 mixing ratio). Also, Resin Obsession that SewEnthusiastic mentioned is a fantastic source for resin supplies. She is online at www.resinobsession.com
and also has some videos on YouTube that go over everything from the basics of mixing and pouring to finishing and drilling pieces. I'm getting ready to put in another order with her soon. She is fabulous.