No special oven. There are several polymer clay tutorials and lots of directions here on Garden Art. Charleen seems to do a lot of clay, so I'm sure she has really good specific answers.
I do use a baking sheet that I only use for this clay, and there will be directions on the clay package. I use Fimo clay and it fires at 265 for 20 - 30 minutes. Other brands might tell you something else. Some people use a toaster oven and only use it for the clay. Anyway, directions are on the clay packaging and also on many of these threads as well as all over the internet. Just google polymer clay.
