how to find foreign customers in the internet?

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Hi,friends!what do you do? I am a international trade sales.Because i am a graduating student ,i want to learn something from my job.But in my current job,nobody teach me how to deal with my job,and i think the style they work is not very well. I already worked in this company more than ten days,but i still donot know how to find useful customer.Pls help me.Thank you !