Need help with Castbar script

[wetesla]

Hey guys,

new to this place and also to LUA. I already asked this question in the official WoW Forums but no one seems to care.
Currently I am working on a Castbar Script that places a Cast Bar with a small border under my player/target/focus frame and changes color if it's not interruptable.

This is what I have so far:

--PlayerCastBar
CastingBarFrame:ClearAllPoints()
CastingBarFrame:SetPoint("Bottom",UIParent,"Bottom", -230, 150)
CastingBarFrame.SetPoint = function() end
CastingBarFrame:SetHeight(30)
CastingBarFrame:SetWidth(225)
CastingBarFrame:SetStatusBarColor(1,1,1)
CastingbarFrame.SetStatusBarColor = function() end

--NotWorking
CastingBarFrameText:ClearAllPoints()
CastingBarFrameText:SetPoint(Bottom,0,0)
CastingBarFrameText:SetFont(testFont, 12, "Outline")
CastingBarFrameBorder:SetTexture(nil)
CastingBarFrameFlash:SetTexture(nil)


--Timers
CastingBarFrame.timer = CastingBarFrame:CreateFontString(nil);
CastingBarFrame.timer:SetFont(testFont,12,"OUTLINE");
CastingBarFrame.timer:SetPoint("TOP", CastingBarFrame, "BOTTOM", 0, 0);
CastingBarFrame.update = .1;

hooksecurefunc("CastingBarFrame_OnUpdate", function(self, elapsed)
        if not self.timer then return end
        if self.update and self.update < elapsed then
                if self.casting then
                        self.timer:SetText(format("%2.1f/%1.1f", max(self.maxValue - self.value, 0), self.maxValue))
                elseif self.channeling then
                        self.timer:SetText(format("%.1f", max(self.value, 0)))
                else
                        self.timer:SetText("")
                end
                self.update = .1
        else
                self.update = self.update - elapsed
        end
end)

My problems are:

1) The default WoW Border still shows up.
2) I don't have a clue on how to add a proper spell name and cast time to my bars.
3) I don't know how to create a border around the cast bar that sticks to it in case if have to adjust the cast bar position.

May seem like a dumb question but I have never learned a programming language before.

Cheers