Hi Illia,
I am quite new to TS, purchased it a few months ago and now I am starting to use it. I'd recommend a book I am currently reading. It is quite useful to get organized how to start programming EL. It is 'How to build winning systems with tradestation' , written by John Jill and George Pruitt of Futurestruth. They do not show you the holy grail-system but it is quite useful for me to learn how to benefit from being properly organized formula writing with EL.
Regards,
Martin