T-Flare has several sets of rules.
First and foremost, be respectful to other users, even if their views and opinions are not the same as yours. Opinions vary so do not try to force another viewpoint onto someone else who already has a view on such an issue.
While generally things are very relaxed, there are limits. Advertising is banned, as is Racism and any gender jokes. Religious debates are frowned upon as one may accidentally insult another's religion and lead to all kinds of trouble.
The general style of battling is standard rules. The standard clauses are in effect, item clause is debateable. An overview of the battling rules may be found here.