I had a read and have some questions?

* What makes your FB group any different to AIPP etc. It appears to just be developing as another 'professional' member body?
* How are you going to check your members for working with children? Are you going to do police checks etc?
* How will you deal with a member breaching your rules? If you put your group out there as 'safe' photographers for working with children, the impact of a 'rogue' photographer could be devastating, and could possibly result in legal action against the group.
* How is what you offer any different from the card system in Queensland that allows people to work with children?

Whilst I commend you on the concept, I think you need to do a lot more work before you start inviting people to be members.