How did Muhammad first begin to spread Islam?
Here, read this http://www.al-islam.org/restatement-history-islam-and-muslims-sayed-ali-asgher-razwy/birth-islam-and-proclamation-muhammad It gives a lot more information than anyone here could give you :P
Prophet Mohammed (Peace Be Upon Him), Started preaching Islam after he received the the revelation from angel Jebril today know as the Quran and when His companions heard it they started accepting Islam and Islam slowly started spreading throughout Arabia
Muhammad was meditating in a cave outside of Mecca when he heard the voice of Gabriel, and he decided he was one of the last of the prophets. When he wasn't pleased with things happening around him, he began to preach Islam, preaching peace, justice, and charity.
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