I don't think Ardor forgers gets profit from child chains. Child chain native fees will go to child chain block bundlers, who will pay Ardors to Ardor main chain forgers. Correct me if I'm wrong.
That's correct, but in practice most forgers will also be bundlers, at least for the major child-chains. There's not a lot a 3rd party bundler can do that a forger can't do for themselves more efficiently.
I believe the main role for a non-forging bundler is to sponsor a child-chain, making its fees lower than they otherwise would be if it were left to forgers.
''Because it is 100% Proof-of-Stake, no additional processing will be needed for mining as no new tokens will be created.''
Can someone develop a bit of that statement ?
It's contrasting Ardor with Proof of Work coins like Bitcoin. Bitcoin mining uses massive processing power for hashing; its security relies on wasting 12.5 BTC worth of electricity every block. Ardor won't have that overhead.
Will we be able to Stake our Ardor by forging...Or just staking...I'm not sure to understand.
Yes you will, but because the number of Ardor coins is fixed, you'll only get the transaction fees for the blocks you process. There is no block reward in Ardor, no equivalent to the 12.5 newly created Bitcoins that Bitcoin miners get in addition to their transaction fees.