Hello Mayuresh,
I think the best way is to start coding in Lua and not wait to finish reading the books. The best starting point I can think of is download LuaDist and run this file from the command prompt:
> lua quickluatour.lua
This file is from Luaforwindows which is now no longer updated but provided a very good introduction to lua.
The best way to learn it then is to take a simple problem and program it. Like creating a program to do permutations of letters of a string without recursion is a good way to get a hold on using loops and conditions.
Regards,
Milind