There are several ways you can accomplish this.
The easiest would probably be with text file containing nicknames that already visited the channel:
Code:
on 1:JOIN:#: if ($nick !isin $read(nicks.txt,s,$nick)) { msg $nick Welcome we use a "Three Strikes You Out" policy when it comes to rule breaking first 2 "strikes" are warning kicks and the third "strike" is a kick/ban, Rule 1: ----------   Rule 2: ----------  Rule 3: ---------- Rule 4: ---------- | write nicks.txt $nick }
}