要求老外先汇款给我然后我给他寄货怎么说

一般小公司或者个人是会同意T/T 100% IN ADVANCE的,越大的公司规矩越多,一般不会同意预付全款,不过你可以要求先交定金DEPOSIT,余款见提单传真COPY件付款.
PAYMENT TERMS: T/T 100% IN ADVANCE
DELIVERY TIME: WE WILL SHIP THE GOODS AS SOON AS WE GET THE MONEY

100% advance payment.
the delivery will be processed after payment receipt
100% 预付款
收到款后发货
用T/T也可以
T/T是 telegraphic transfer 电汇付款

For payment,we require 100% value,confirmed and irrevocable letter of credit with partial shipment and transhipment allowed clause,available by draft at sight,payable against surrendering the full set of shipping documents to the negotiating bank here.
我们要求用100%金额的、保兑的、不可撤销的信用证，并规定允许转船和分批装运，凭汇票向议付行交单即期付款。

First,Please send the cash(for buy the goods) to me,then I send the goods to you.

一班来说对象是不会给你打全款

Please make the payment in advance .