Help With Boss Script

[DragenFear]

Im learning lua scripting and have been working on a boss

i cant get the spells working right though
this is latest fix but i cant test it yet
Plz be gentle as i am total newb at this and started only 2 days ago

function Carogon_OnCombat(Unit, Event) 
Unit:SendChatMessage(12, 0, "Ahh Somthing Tastier Than These Gnarlpine")
Unit:RegisterEvent("Carogon_SoulBurn", 35000, 0)
Unit:RegisterEvent("Carogon_Thundercloud", 30000, 0)
Unit:RegisterEvent("Carogon_Fear", 18000, 0)
Unit:RegisterEvent("Carogon_Demonarmor", 15000, 0)
Unit:RegisterEvent("Carogon_Pull", 85000, 0)
Unit:RegisterEvent("Carogon_FrostVolly", 20000, 0)
Unit:RegisterEvent("Carogon_Chill", 13000, 0)
Unit:RegisterEvent("Carogon_Morph",1000,1)
end

function Carogon_SoulBurn(pUnit, Event) 
pUnit:CastSpell(19393, pUnit:GetClosestPlayer(0))
end

function Carogon_Thundercloud(pUnit, Event) 
pUnit:CastSpell(39580) 
end

function Carogon_Fear(pUnit, Event) 
pUnit:FullCastSpellOnTarget(26661, pUnit:GetClosestPlayer(0))
end

function Carogon_Demonarmor(pUnit, Event) 
pUnit:CastSpell(31901) 
end

function Carogon_Pull(pUnit, Event) 
pUnit:CastSpell(29979, pUnit:GetRandomPlayer(0)) 
end

function Carogon_FrostVolly(pUnit, Event) 
pUnit:FullCastSpellOnTarget(38837, pUnit:GetClosestPlayer(0))
end

function Carogon_Chill(pUnit, Event) 
pUnit:CastSpellOnTarget(21098, pUnit:GetClosestPlayer(0))
end

function Carogon_Nova(pUnit, Event) 
pUnit:CastSpell(38627) 
end

function Carogon_Firevolley(pUnit, Event) 
pUnit:CastSpell(29922) 
end

function Carogon_BurnStun(pUnit, Event) 
pUnit:FullCastSpellOnTarget(17293, pUnit:GetClosestPlayer(0))
end

function Carogon_Aurburn(pUnit, Event) 
pUnit:CastSpell(30522) 
end

function Carogon_SoulBurner(pUnit, Event) 
pUnit:CastSpell(19393, pUnit:GetClosestPlayer(0))
end

function carogon_heal(pUnit, Event) 
pUnit:CastSpell(17683) 
end

function Carogon_Morph(pUnit, Event) 
if pUnit:GetHealthPct() < 20 then 
pUnit:RemoveEvents(); 
pUnit:SendChatMessage(12,0, "I WILL NOT BE KILLED BY SUCH WEAK MORTALS")
pUnit:FullCastSpell(36467)
pUnit:SetModel(10193)
pUnit:RegisterEvent("Carogon_Nova", 10000, 1)
pUnit:RegisterEvent("Carogon_Firevolley", 20000, 0)
pUnit:RegisterEvent("Carogon_BurnStun", 27000, 0)
pUnit:RegisterEvent("Carogon_Aurburn", 1000, 0)
pUnit:RegisterEvent("Carogon_Nova", 25000, 0)
pUnit:RegisterEvent("Carogon_SoulBurner", 15000, 0)
Unit:RegisterEvent("carogon_heal", 2000, 1)
end 
end

function Carogon_OnLeaveCombat(Unit, Event) 
Unit:RemoveEvents() 
pUnit:SetModel(15879) 
end

function Carogon_OnDied(Unit, Event) 
Unit:RemoveEvents() 
Unit:SendChatMessage(12, 0, "NO THIS CANT BE I WILL NOT BELIVE IT SALIANA SAVE ME") 
end

function Carogon_OnKilledTarget(Unit, Event) 
Unit:SendChatMessage(12, 0, "HA YOU THOUGH YOU COULD KILL ME") 
end

RegisterUnitEvent(510030, 1, "Carogon_OnCombat")
RegisterUnitEvent(510030, 2, "Carogon_OnLeaveCombat")
RegisterUnitEvent(510030, 3, "Carogon_OnKilledTarget")
RegisterUnitEvent(510030, 4, "Carogon_OnDied")

main problems are frost volley, fire volley, fear, pull, burn stun, auraburn and chill dont cast and soul burn was hiting himself
anyt suggestions?
btw i changed the soulburn from fullcastontarget to castspell in hopes it would trget proper then
and he also yends to repeat his enter combat phrase quite a bit as well
So can yall help me?

[kreegoth]

Well dont pop back between Punit and Unit.. Pick one.. secondly.. if it simply says Castspell on the lines with those spells hell cast them on himself.. use Getclosest or Getrandom instead