Am I doing alright so far?

[Northern3D]

I have never coded in Lua before today, and I'm trying to make an addon... Have I messed up horribly yet on the init.lua?

AddCSLuaFile( "cl_init.lua" )
AddCSLuaFile( "shared.lua" )

include( "shared.lua" )
--When a car touches the race line, announce it.
ENT=="3d_raceline"
if ENT:StartTouch(ENT)
	then print("It Works!")
end

if sk_allowdeath == 0 and if player.GetAll(Entity:Health()) < 100 then
	player.GetAll(Entity:SetHealth(100))
	print("Set to 100")
end

sk_allowdeath being a setting from the addon file
Will it run properly?

[c👌de_g🎷]

Can you give a description of what you're trying to do?

[Northern3D]

--When a car touches the race line, announce it.
ENT=="3d_raceline"
if ENT:StartTouch(ENT)
	then print("It Works!")
end

When something touches a brush named 3d_raceline print "It Works!"

if sk_allowdeath == 0 and if player.GetAll(Entity:Health()) < 100 then
	player.GetAll(Entity:SetHealth(100))
	print("Set to 100")
end

if a setting named sk_allowdeath is 0, and if any player's health is below 100 then set everyone's health to 100 and print another useless thing.

[c👌de_g🎷]

Is this in a gamemode's init.lua or an entity's?

[Northern3D]

gamemode.

[Jcw87]

This is gonna crash and burn immediately. It looks like what you want to do is create a custom entity to act as your starting line. To do that, you should create a new script for the entity, and define the ENT:StartTouch() function there. And define it as a function, instead of trying to call it.

function ENT:StartTouch()
-- this code runs when your entity touches something. you can use the name 'self' to refer to the current entity instance.
end

You will also need to define a few other things for the entity. I suggest finding a tutorial on the wiki.