[Mangos Zero] About some Scripting

[well]

Hello all

I want to ask one thing:

1. I want to make one debuff to be applied to the target. Done ~>

if (auraSpellInfo->Id == "ID")
{
  trigger_spell_id = "ID";
  target = pVictim;
  basepoints[0] = damage * 45 / 150;
}

2. if magic spell or dot hits the target the 45/150 + normal dmg is applied and the debuff should be removed.

my answer is how? can someone make one example?

Thanks in advanced