I am having a few issues with eCrater

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I am having a few issues with ecrater. I am hoping to find someone who can answer a few questions for me. I didn't find anything on their fee structure. What do they charge me if I sell something? How do I set up to ship to places beyond the US and actually know what to charge them. I am having trouble using their system. It is slightly different from Ebay. Thanks...Has anyone had any bad experiences I need to know about before hand?