Only the better ingredients can make the better products. Is there any problems with this sentence?

Please help to correct this sentence. Daily delivery product is the most important business line in retail chain stores. About 60% revenue flow in the chain store should give credit to this business line. We are professional daily delivery product supplier, we put major effort into developing this business line, deliver a lot products, such as: Natural Yeast Bread, raw materials of salmon sushi and cod sushi, etc.

What does "O`Brien" mean in the item named "Hash Brown O`Brien POTATOES" ? Please give me a full explanation if you can. Thanks.

Could anyone please take a look of following reply email and correct the errors? Thanks Dear Mrs D, It`s a little embarrassed for me to know that XX did this. I`m very sorry for your trouble. I`ll talk to XX about it and please feel assured! I`m grateful for your kindness and hopefully you`ll keep an eye on him in his future school life. Thank you very much. yours, X

Please correct my grammar or tones in following sentence. Thanks. We can set up a class frequency for now, and change it according to xxx`s learning conditions after maybe half a year.

A Letter to Miss Megan Dear Miss Megan, I`m really glad to hear that you can be xxx`s tutor. Here are couple of things I want to talk to you: First, xxx is poorly in English, and I know your Chinese isn`t that fluent either, so will there be any difficulty in your tutoring? Second, My house is just five minutes away walking distance from school, I`d like you to come to my house each and every working day after school, is that possible? Third, how much do you charge? Fourth, I can`t speaking English, I`d like us to discuss xxx`s learning condition use email that I can communicating with you through some help, is that ok for you? Looking forward to your reply :) Best Wishes, Ying