is it easy to earn money by selling things online? (please help me out)

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my friends father is a manufacturer of shawls and they sell it at wholesale price. he had asked me to become a partner in selling things on e bay. he can bring me the shawl worth 70$-200$ at a much cheeper rate 30$. i will list it on ebay i will be handling all the things like to update the shipping detail,etc. can you please tell me the +ive and -ive things of selling things online i think its a golden opp. for me to start earning huge profits. should i accept the offer what you will do if you get the same offer???