Dear Linda,
亲爱的琳达，
I'm very glad that you'll come to China to watch the Olympic Games. I know it isn't easy to learn a foreign language,but I have some ideas that may help. Firstly,it's very important to listen to the teacher carefully in class and make some notes so that you can go over your lessons later. Secondly,try to catch every chance to practice speaking,both in and out of class. Don't be afraid of making mistakes. Then try to listen and read more in Chinese. What's more, you'd better plan your time well and study it regularly every day.
我很高兴你能来中国观看奥运会。我知道学一门外语不容易，但我有一些想法可能会有帮助。首先，在课堂上认真听老师讲课，做笔记，以便你以后复习功课，这是非常重要的。其次，尽量抓住每一个机会练习口语，无论是在课堂上还是课外。不要害怕犯错误。然后试着多听多读中文。更重要的是，你最好计划好你的时间，每天都有规律地学习。
Above all,you should be confident in yourself and don't give up whenever you meet with difficulties. I'm sure you will succeed through your hard work.
最重要的是，你应该对自己有信心，遇到困难时不要放弃。我相信你一定会通过你的努力获得成功。
Best wishes and look forward to meeting you in China.
的祝福，并期待在中国与你见面。