I recently got started by following couple videos on YouTube which are not hard to find. I've just followed very basic lessons, mainly to get familiar with non-programming aspects (scripting part is very easy if you already know programming).

There is also a Humble Bundle out there right now where you can get some basic lessons as low as $1[1]

[1] https://www.humblebundle.com/software/learning-game-coding-a...