这种付款方式有什么风险？

到一询盘，说到付款方式，不怎么看的懂。请看懂的朋友帮忙解释解释是什么意思。谢谢。 if everything goes well and we make business please read the points below. 1.??i would like to know when you can delivery the product (we need it in march), also we use lc because it’s the first purchase that we are going to make with your company. 2.??attached me the price cif and fob. 3.??we give to our suppliers 50 days to ship the goods. 4.??to send the bl to bank we give 7 days because usually the bl arrive late and we paid extra fees. because you send it to the bank in mexico city (we are not in mexico city but in mexicali) after the bl arrives to mexico city took b广告een 2 or 3 days after the bank in mexico city send it to mexicali bank could take 2 days if the bl doesn’t arrive on weekend if so could take 4 days to get it after the bl arrive to mexicali bank take 1 or 2 days to he the bl in our company and that after we send it to the port….so that could be b广告een 5 or one week more, so that’s the reason why we don’t give that much time. i hope you can help me and you understand that part.