It is suggested that you keep a printed copy of it for reference while you're getting used to these key assignments. There are many Unicode Urdu fonts available for free download. In Persian, the vowel "Alif" is generally pronounced like au in the English word maul. Since preparing TeX files for Urdu documents requires frequent switches between the Urdu keyboard for text and the English keyboard for special characters and TeX commands , you might consider setting up Keyboard shortcuts for that purpose. When inter-word spaces are used, there is no confusion between any unintended "words" and the intended words because the beginning and end of each intended word is clearly delimited.
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