Arabic keyboards lack many important special characters. Here is a list of the most important characters and signs which you can copy and paste.
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 longest word (expression) in the Qur'an is "fa’asqaynākumūhu" فَأَسْقَيْنَاكُمُوهُ and means: so we gave it to you to drink.