Lua TFS 0.4 Quest NPC Help

[TomBartezz]

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}
function onCreatureAppear(cid)                npcHandler:onCreatureAppear(cid)            end
function onCreatureDisappear(cid)            npcHandler:onCreatureDisappear(cid)            end
function onCreatureSay(cid, type, msg)            npcHandler:onCreatureSay(cid, type, msg)        end
function onThink()                    npcHandler:onThink()                    end
function creatureSayCallback(cid, type, msg)
    if(not npcHandler:isFocused(cid)) then
        return false
    end
local goldenNuggetID = 2160
local storageValue = 10102
local goldenHelmetID = 2471
local name = getPlayerName(cid)
local talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_DEFAULT and 0 or cid      
                        -----------------------------------------
        if msgcontains(msg, 'frozen helmet') then
        if getPlayerItemCount(cid, goldenNuggetID) >= 20 then
        if getPlayerStorageValue(cid, storageValue) == -1 then
        setPlayerStorageValue(cid, storageValue, 1)
    selfSay('Do you have 20 crystal coins to exchange?', cid)
    talkState[talkUser] = 1
        else
    selfSay('You already made this quest', cid)
    talkState[talkUser] = 0
    end
    else
    selfSay('You don\'t have 20 crystal coins!', cid)
    talkState[talkUser] = 0
    end
        elseif(msgcontains(msg, 'yes') and talkState[talkUser] == 1) then
        doPlayerRemoveItem(cid, goldenNuggetID, 20)
        doPlayerAddItem(cid, goldenHelmetID, 1)
    selfSay('Thank you ' .. name ..'', cid)
    elseif(msgcontains(msg, 'no') and isInArray({1}, talkState[talkUser]) == TRUE) then
        talkState[talkUser] = 0
        selfSay('Ok then.', cid)
    end
    -----------------------------------------
return true
end
npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())

Hello, I would like some help adding more lines to this script, where a player says hi>starter set>frozen helmet or frozen armor or frozen boots or frozen legs or frozen shield (does what the ifmsgcontains does but each items has its own storageid) and another line where a player says hi>mid set>lava helm or lava armor or lava boots or lava legs or lava shield (does what the ifmsgcontains does but each items has its own storageid)

For example:
Player: Hi
NPC: Hello player, would you like to do the {start set} or the {mid set}?
Player:start set
NPC: Would you like to do the {frozen helmet},{frozen armor},{frozen shield},{frozen boots}, or {frozen legs} quest?
Player:frozen legs
NPC: +1 to storageid for legs and request the items as shown in the script and player cannot do the quest again