For instance if you have your BTC on the wallet blockchain.info, will they get your BCC in the same wallet or in another one?
No, you don't have control to your private keys there and there's no statement that blockchain.info will support BCC.
In case you have BTC in a exchange like Kraken or Coinbase, will they also get you your BCC? or how will it work?
Coinbase = no, kraken = yes but it's better to put your bitcoins into a wallet that you hold your private keys.