[grand.Theft.Otto]

pawn Code:

// ongamemodeinit

SetTimer("SendMSG",60000); // set for every 1 minute

// bottom of script

public SendMSG() // will send all messages from the RandomMSG array we created below every 1 minute
{
    new randMSG = random(sizeof(RandomMSG)); //calculates the size of RandomMSG 
    SendClientMessageToAll(0x33CCFFAA, RandomMSG[randMSG]); // Replace the "color" with your defined color.
    return 1;
}

// top of script

new RandomMSG[][] =
{
     "message 1 here",
     "message 2 here", 
     "message 3 here",
     "etc..."
};