My first short story was recently published (yay!), and now I'm looking at the possibility of reprints. I've been looking over my contract, and it seems the only issue I need to worry about is the "right of first offer on... first foreign serial rights." The trouble is that I'm not sure how to approach other markets while respecting those rights. Do I need to ask permission before submitting elsewhere, or do I just need to submit and then ask permission once it's accepted? Or is there something else to it?