The word Allah is often written like a calligraphy - with the dagger Aleph. There are several ways to achieve that in Microsoft Word or Libre Office.
Times New Roman or Arial are not the only fonts to write in Arabic. Google Fonts offers many beautiful Arabic fonts for free - it works also for Apple/Mac.
The plural of Mustafa in Arabic is difficult - because there is a weak letter involved. How do you form masculine human plurals with a possessive pronoun?
Many students are confused why words like هذا, ذلك or لكن are written with a dash (dagger Aleph). Should they be pronounced with a long vowel ("aa")? Yes.