Reading between the lines, it seems like there are 2 separate and distinct issues for you to address here:

1) How do I familiarize myself with PRD ?

2) How do I find a quick and painless way to work with JASS?

These are separate and distinct because the answers are not necessarily mutually compatible. Getting closer to one may take you further from the other.

A quick Google search reveals that PRD may be *overkill* as far as answering 2). Nevertheless it is a good tool to have in your 'toolbelt', so hats off for you trying to use it. It's just that there may be way easier paths if all you *really* want to do is answer 2).

eg ... 3 verbatim google searches:

JASS warcraft 3 "syntax highlighting"
[download]

warcraft "jass IDE"
[download]

warcraft "jass Editor"
[download]

... each one of these pulls up some links, each one appears to have directly relevant answers ... and you appear to have an internet connection, so the ball is in your court ;-)