Just basic usage example (this is for 2.3, but will give you a clear idea for 2.2b3):
// init.sqf
// Mando Missile ArmA initialization
[]execVM"mando_missiles\mando_missileinit.sqf";
Sleep 1;
if (isServer) then
{
[my_first_sam, 0, ["Air"], 12, 500, 3000, 5, [0,1,2], 360, 0, [west,sideEnemy], false, false, true, true]exec"mando_missiles\units\attackers\mando_basicsam_unit2.sqs";
};
Being my_first_sam a Shilka unit.