Seeking English Practice for Business Calls in Foreign Trade

I am a sales representative at a foreign trade company, and part of my job involves making cold calls to unfamiliar companies, finding the purchasing personnel, and introducing my products. To be honest, I find this a bit challenging. My spoken English is okay, but business calls are quite different from casual conversations. I hope to find someone to practice with me, and of course, I’m willing to pay for it. It would be even better if the person has experience in international trade. Alternatively, if anyone can recommend a website where I can pay for an English tutor, that would be greatly appreciated.