For learning Arabic language it is necessary to know alphabets in Arabic. You have to know alphabets in Arabic to learn writing in Arabic language. Arabic alphabets are the building blocks of Arabic language. There are 28 characters in Arabic alphabets. Arabic alphabets are made up of Arabic vowels and Arabic consonants. The Arabic alphabets contain 8 vowels and 28 consonants. Arabic vs German gives a comparison between Arabic and German alphabets.
Arabic script is also known as Arabic writing system or Arabic orthography. The set of visible signs used to represent units of Arabic language in a systematic way is called Arabic Script. The Arabic language uses Arabic i.e. Arabic alphabets are derived from Arabic script. The script decides the writing direction of the any language, hence the writing direction of Arabic is Right-To-Left, Horizontal. Learn Arabic Greetings where you will find some interesting phrases.
Is Arabic hard to learn? The answer to this question is that it depends on one's native language. One should start learning Arabic language with Arabic alphabets and Arabic phonology.
Time taken to learn any language that is mentioned here is the approximate time required to learn specific language for the person who is proficient in English. You can also go through all Indian Languages and find if Arabic is one of the language of India.