You have to notice them any change of your condition, such as changes of address,family members, this is required by law. Don't take chance of that, your application could be denied or revoke even you get landing paper.
If you will be in US in the next two years, you can send your application to Buffalo. But you should be aware that two years is sufficient for most cases, not for all. If you will go back to China within 1 and half years, I will recommend you send your application to Hongkong consulate. The processing time in Hongkong is about 3 years.
If you will be in US in the next two years, you can send your application to Buffalo. But you should be aware that two years is sufficient for most cases, not for all. If you will go back to China within 1 and half years, I will recommend you send your application to Hongkong consulate. The processing time in Hongkong is about 3 years.