Hi, my lotters, how to advertise my online shop??

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These days I've been preparing my online shop, I have a job in bank, but I want to earn extra money, so I want to try "online shop". I sell dress shirts, sport shirts and polo shirts, but the biggest problem is how to advertise my shop? I'm a new seller, I really need your help. Any advice is welcome, :) thank you so much. *_*