Hello,
You should start by taking a look at these thread:
http://forums.adobe.com/message/1264607#1264607#1264607
This should helpfull for exporting arts from your Artwork tree. You will know which APIs to use.
Working with artboard will be a little bit more complicated. Since artboards are not in the artwork tree, you will have to implement a hit testing solution in order to retrieve arts beneath this artboard. But do not panic, there an API for that too. (just take a look in the .h files).
But, this part will be the hardest part of your work.
Thomas.