First time dealing with wholesaler, i need help please

Hi all, Im planning to buy from a wholesaler for the first time, I was wondering if anybody has tips on what kind of agreement to make with a wholesaler for the first time? For example: - payment terms ( would you pay 100% upfront or would you pay 50% first & 50% after delivery ) - delivery terms ( such as what happen with delivery or dammage/ faulty goods) Thanks for your help

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