帮我翻译几句话，语气委婉一点，客气一点，不要Chinglish，麻烦了各位！

Dear David,

We'll send you documents as soon as we prepared it, because only can we get the original we can apply to customs.

Any problems, pls contact us.

Thanks & regards!
XXX

亲爱的大卫：

一旦我们准备号文件，就会会立刻给你寄过去，因为所有文件都只有拿到正本才能申请报关。

有什么问题，请同我们联系。

谢谢！

XXX

Hi David,
Please wait until we finish the preparation of the final documents.
We need all the documents in original, which is mandatory for custom clearance.
Please don't hasitate to tell me if anything I can be help. Keep contact!

中文想怎么说？这样吗？

大卫你好，
请等我们将最后的文件准备好。
我们所有文件的都是需要正本的，这样子才能去通关。
你有什么不明白地方请告诉我，随时保持联系。

Hi David, after we prepare for the last documents, all documents we need should be original, so that we can clear customs, if you have any doubt, please contact with me freely.