It isn't a stupid question at all. You want to use steel. Not copper or aluminum because they expand when heated and can cause cracks. My craft store is horrible and doesn't stock crafting wire but the do have floral wire and you can get a large spool very cheaply. The problem with floral wire is that is is usually green. It is also thin so you have to double the strands and twist them to make them strong and this sometimes causes the green paint to flake off and get on the clay. If you are painting after then it is no problem but i use colored clay so it can be a hassle. I have learned to wipe the strands after I twist them to remove any loos paint ant it usually works fine.
Awe...that is so sweet of you ...I was looking at your gallery and you make some very nice human form sculptures. I have been wanting to try human form myself and have done a little of it but I can't find the right model so I stick with ponies. Yeah, it took me awhile to learn that about the wire. I used the same wire for a long time and then ran out. I used some other wire I had lying around and 3 sculptures in a row cracked before i realized it was because of the wire, which was aluminum. What were you making when it cracked?