If I hold ETH?
People who own ETH coin do not need to take any special measures unless the exchange, web, mobile, or hard wallet they use tells them to do something. As Vitalik Buterin explained, theres no need to dump your non-Constantinople coins.
I could not find any information on how to get the forked coins. I have some ETH in my Mew wallet but I do not see any other coins in there. Any information regarding that?
There are no chain split,just upgrade to current ETH network. No one accepted free ETH for holding ETH on this fork. By the way, if chain split is going to happen then holding ETH on cold storage is more secure than holding your assets in online wallets.