returning to work and FTB A+B

[allycat06]

At the moment we get both FTB A and B (it's about $280 combined, is that the full amount?) as I'm at home with DS and go to uni and DH works full time. I'm going back to part time work next month and am a little confused as to what happens with Centrelink and I reckon I'll get a more helpful answer from someone here then by actually calling Centrelink. So can anyone help me out?

When I start working again we won't qualify for FTB B anymore right? I'm pretty much just going back for something to do and get out of the house for a bit so only 8 hrs a week (around $200 gross a week) will that mean FTB A will get decreased as well? How much can I earn before it starts reduce? At the moment we're also entitled to a bit of parenting payment but we've never bothered to claim it, will I still qualify for it if I work a little bit?

All this stuff seriously hurts my brain so if anyone can shed a bit of light on the situation I'd be very appreciative.
Thanks