In the a nutshell these are the rules:
5v5
Any less then 5 members in clan war = AUTO FORFEIT
Haveing a member drop out of clan war and not come back before 5 min = FORFEIT
NO OFFENSIVE NAMES OTHERWISE = DROPED FROM LADDER : '(
When the game starts you have 5 mins to join and make up 5 people otherwise = FORFIET
Win by having won more rounds NOT higher group score
There is a ONE (1) hour time limit; round time is 1.75 minutes (1 minute 45 seconds) long and 15 rounds. You must play 15 rounds as terriost and CT and win the majority to win the clan war
Also gobal chat is allowed for captains ONLY, if you gobal chat we will be FORFEITED
ALSO HACKS WILL GET US ALL BANNED AND YOU ATTACKED BY THE REST OF THE CLAN IRL

For more of the rules go to http://www.gamearena.com.au/pc/games/title/counterstrike-source/ladder/index.php?action=rules#2