Linux does not use Windows apps natively, so to answer question:
K-Lite - not needed, just install the codecs for your relevant distro, there is oodles of information on this and a simple "Ubuntu DVD playback" or "Ubuntu codecs" ins Google should set you straight. If you download the Linux Mint DVD then everything gets install by default.
Daemon Tools - not needed, you can mount an ISO with mount -o loop /path/to/iso /path/to/mountpoint. I have not searched for a gui tool to do this but there is bound to be plenty to choose from.
Steam - steam works with
wine (emulator) and some games will work flawlessly in Linux. I think as a rule of thumb, if the game can be installed on Mac it will run well under wine, don't quote me on that since I only play CS and TF on steam.
With all the rest there should be no problem, if you use a specific app in Windows you can just search for an alternative in Linux. It is a learning curve you will just have to commit to if you want to use Linux. Shut down the Windows part of your brain and start afresh.