One of the other ladies on here has had a go, but I don't know how it has turned out, and some others have success. There is a short thread on it a few pages back, I am sure.

I googled "sourdough starter", and the fifth one down has a basic beginner how-to ("how to begin"), which we have both read, and seems helpful.

Good luck. I'm not going to make sourdough, as I don't think anyone else in this little black duck's house will eat the stuff.