How to earn money in second life

Well my first posting on second life I said there must be potential to make money. I am still not sure how to other than sitting on camping chairs. So if there is anyone out there with any hints or tips I would be grateful. Buying and selling land seems to be a good idea, but I think I will stay away from that one till I have a bit more experience in this virtual world. I suppose I could try being a lap dancer but since I have only just learned how to walk in a straight line I don't think my dancing would be up to much.