It's been awhile since I scripted Pawn.. Here you go..
[pawn]public OnPlayerSpawn( playerid, classid )
{
//Player has spawn so we disarm him first...
SetPlayerWeapon( playerid, 0, 0 );
//Now we give player weapons...
SetPlayerWeapon( playerid, 10, 1 );/*Katana*/
SetPlayerWeapon( playerid, 22, 9999 );/*Tec9*/
SetPlayerWeapon( playerid, 21, 9999 );/*Stubby*/
return 1;
}[/pawn]