Shepherd and then merchant.
Abu Qasim
He worked for a business WOMAN named Kadija who gave him a job. She was quite a bit older than him and he married her.
Job was not a prophet.
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Before being prophet, Muhammad (PBUH) was a shepherd and a merchant. Then he was assigned by God as prophet through God revelation of Quran to him by God through the angel Gabriel (Jibril).
Elihu
a farmer
In the book bearing his name, little is revealed concerning Hosea except that he was the son of Beeri.
The departure to Madinah is known as the Hijra'.
There was no one named Muhammad before the prophet(PBUH).
Muhammad was born in 570 AD in the city of Mecca.
Before God revelation of Quran to prophet Muhammad through the Angel Gabriel (Jibril), he was a shepherd and then a merchant. After being a prophet, by God Assignment to him, his first Job and primary job was to convey God message, through Quran holy book, to worship only God (Allah) the Creator the one and only one God, with no partner, no associate, no partner, no son, or resemblance. Refer to question below for more information.