尼泊尔采购需求：净水器、滤水器、制水机、海水淡化厂、过滤机、海水淡化机

I'm looking to get a better understanding of the ordering process for your products. Could you provide a detailed breakdown of the steps involved, from initial inquiry to final payment? Additionally, it would be helpful to know if there are any specific requirements or documents that I need to prepare beforehand. Understanding your lead times and shipping options would also be great. Thanks!