For learning Thai language it is necessary to know alphabets in Thai. You have to know alphabets in Thai to learn writing in Thai language. Thai alphabets are the building blocks of Thai language. There are 44 characters in Thai alphabets. Thai alphabets are made up of Thai vowels and Thai consonants. The Thai alphabets contain 32 vowels and 44 consonants. Thai vs German gives a comparison between Thai and German alphabets.
Thai script is also known as Thai writing system or Thai orthography. The set of visible signs used to represent units of Thai language in a systematic way is called Thai Script. The Thai language uses Thai i.e. Thai alphabets are derived from Thai script. The script decides the writing direction of the any language, hence the writing direction of Thai is Left-To-Right, Horizontal. Learn Thai Greetings where you will find some interesting phrases.
Is Thai hard to learn? The answer to this question is that it depends on one's native language. One should start learning Thai language with Thai alphabets and Thai 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 Thai is one of the language of India.