If you really want to learn Lua then I can send you a Lua book over PM,
which starts at the absolute basics of Lua to some more advanced topics.
In my opinion it's easier to start with that book instead of:
http://lua.org/pil, because pil has a lot of coding terms
and stuff, which in the beginning don't make any sense at all.
Just let me know if you want it and I'll upload it for you and send you a pm.