here you go...

for chinese stores, this is a good place to start with:
http://www.atlantachinatown.com/directions.html

there is another chinese supermarket (Ranch 99) also very close to chinatown. Ask anybody in chinatown you can find out how to get there.

There are some nice places to visit near downtown area and it takes about one whole day to see them...

Olympic park, CNN center, Coca-cola center, underground atlanta. And they are all in walking distance.

Welcome to Atlanta, Enjoy!