Not tried the Commander but I did sample the Six Launcher a while back which I uninstalled 2 minutes later due to it being a huge monster of an app taking up too much space and being a bit too confusing. I just install/update it manually with the direct files (which just looking on the site don't seem to be there any more

) or the Torrent file which is available.
YouTube how to install it if you get a bit stuck as there are loads of videos and guides for it. There is a handy guide on the wiki:
How to install DayZ - DayZ Wiki
I'd recommend trying vanilla DayZ first and when your comfortable with it, sample Lingor Island (a separate mod required) -
Lingor Island - DayZ Wiki
Tips to start with?
- Trust no one unless you know them. Treat any survivors you see as a threat. if they have a bandit skin, shoot or run!
- You will die often to begin with so don't let it put you off.
- While the cities and military bases are more dangerous, they have better loot so are worth the risk, as long as you get out alive!
- It's an Alpha mod so bugs do exist.
- May be worth starting on a lower population server to reduce the risk of death by bandits.
- Find a gun fast. Even if bandits don't kill you,, the zombies will!
- Maybe worth running through the basic ARMA2 tutorials to get familiar with the controls too if you;ve never played it before.