If you can, get one or two people to help you start the conversation. This can be viewers you have seen before, friends of you, other models, or whatever. Just find someone you can ask something neutral, how the weather is, if they have seen anything good on TV, what they think about your new bra, anything that is light and not all that personal. That way you don't have to wait for someone to be the first one to talk, and it is easier to get it rolling that way.