The structural change is regular. That is you don't have to learn each name plural.
The Arabic writing system is exotic looking but easy to learn, which is a rare combination. The language uses a straightforward alphabet, but because letters change their shape depending on what their neighbors are it is quite impenetrable to the uninitiated.
I thought the same thing for English and French, no? When I learn English and French in school, we join letters.
Formal Arabic distinguishes between groups composed entirely of women and groups that contain one or more men, and has distinct pronouns, plural forms, and verb conjugations for feminine dual and feminine plural.
The same for french. (Il, Ils, Elle, Elles, On)
What we call Arabic numerals aren't used in Arabic except in extraordinarily formal contexts. Instead, Arabic uses "Indian numerals", which look like this:
Not true. The real Arabic numbers are the ones used today. The Indian numbers were used in the middle east region because of the strong Indian influence.
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Well, if you are really interested in Arabic, then what you should learn is the Arabic poetry. It's one of the marvelous human inventions. It's very hacky, and quite hard to write. The wealth of books (old books) and poems written in Arabic are worth learning it.