Correctly flash Windows

Hi Guys, found some information around, but still not 100% on how I should be doing it. The house is clad with Weathertex and I want to make sure I get it right. At present this window will cop the rain, however down the track it will be under a verandah roof (Yet to go back up $$$$).

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I also want to have architrave around the window (Outside), I think its the 66x18 or something Colonial style, if that makes any difference.
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