[Translation from Japanese to English ] Since this is my first transaction with you, I'll give you a 50% payment up f...

それではあなたとは初めての取引なので、私が最初に半分支払います。
その後あなたは商品を発送してください。
私が商品到着を確認後、残りの半分を支払います。
以上のやり方でよろしいでしょうか。
よろしければ返事をください。
すぐに半分の＄310を支払います。
よろしくお願いします。

Since this is my first transaction with you, I'll give you a 50% payment up front.
Please send it to me after you receive the payment. Once I receive the product, I will send you the rest of the payment. Does that sound all right to you? Please let me know. I can send you the half payment of $310 promptly. I look forward to hearing from you.