Cailin makes a good point, I get a rebate from the govt so I don't actually pay the full amount and I have the peace of mind that Riley is with a registered carer who has inspections done on her etc. Not saying you wouldn't be great but you see some horror stories about unregistered carers on current affairs shows so people will be naturally wary. If you have people who know you they would probably be fine about the fact that you are unregistered and cash in hand.
I hope I don't sound too negative i just want you to know things which would be useful in this situation.
A good thing to get into may be after school care where you just have the children for a few hours after school. I know parents at our school who have been desperate to get their kids out of formal after school and vacation care at the school and into something more home based.