Questions pertaining to my first game

I have been making a Binary Land clone for fun in my spare time but I'm not sure what versioning system I should use (I don't even know what the different versioning systems are, could someone enlighten me?) and what copyleft license I should use.

Could I have some advice here, /prog/?

>>1
For a license, I'll recommend this Digital Freedom License I'm using. It's a BSD sublicense with provisions against Digital Restrictions Management and other mafiaa/lawyer/patents bullshit.

http://wiseman1024.googlepages.com/license.txt