Advertising for creating advertisements - Help needed

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Hi, I have always been interested in advertisemnts and i creating them too. Right now though I am employed i a different field altogether, I wouldstill like to be a partof advertising and work as a freelancer to earn extra money, as it also saves a lot for the companies while getting their ads done. A simple two way profit. ** I need some advice as how to get clients for this purpose easily with no costs for me.