As you go through the trouble of purchasing international flights and spend all that money, you don't want to wander aimlessly. Pick some of the best and most popular destinations that you are interested in before hand. Get all the information you can about those places so you can get a feel of the history and its significance as well.
Here are some places you'd want to consider. In Beijing, you will want to see the Forbidden City and the Great Wall of China. Set aside enough time for exploring these areas. Next, consider Xi'an to see the Terracotta Army. Look up its details on the internet and check the details.
You also don't want to miss Shanghai, Suzhou and Hangzhou which is only one hour away by the Bullet train. That train ride will also be a unique experience. These are just a few of the most popular and prominent places. There are lots more that you will certainly enjoy visiting in China.