Julie:

That's good advice, I think. So far I have been shooting for free too. However, people are starting to ask me how much I charge, and are wanting to set up as paying clients. That's why I'm trying to figure this out now.

Any advice there? Maybe if they ask, charge enough to cover materials, but waive a sitting fee? What do you think?

In your own case, when did you decide "Okay, I can start charging now." About how long was that for you?