I learned from converting simple GUI-triggers to custom text and then viewing that, you could try that too. Also, download JassCraft or similar if you haven't :)
I find jasscraft old and outdated compared to newer solutions like Jass New Gen (good thing to get if you wanna get in to jass), and that in-trigger editor syntax highligter (check the editing tools forum).
As for tutorials and such, check my signature. Pyrogasm has no life