Don't know where to start- Help Please

Earlier I thought it would be cool to make a Counterstrike type game for my own amusement, unfortunantely I have not idea where to start. I am useless with JASS , so if anyone has any ideas for the Gunfire triggers (how the "bullets" spread out and damage players and such) in GUI it would be greatly appreciated. I tried the Cluster Rockets, though it was absolutely useless. Thanks in advance.

... check the resource submissions area or type in ammo system in the search tool.

-Av3n