Has anyone got experience of using eCommerce software (such as eSellerPro, ZenCart, Magento) and/or stuff like Amazon and Ebay for trade listings?

If so, could you give me a quick rundown on them? A short Idiots Guide, if you will...

It seems like it's quite easy to top up your wages if you're a whizz at this sort of stuff (though as you all know, i'm already well wadded).

Cheers, friends.