Not really advice, sorry. Just a note to say I used to do it--no more. Shipping is an additional pain with more forms, more checking on shipping charges, can't quote a ship on a heavy item to England then it's bought by somebody in Brazil. Differences take forever to work out.
But this is just one cranky person's experience. I wish you the best of luck, the poly bags for clothes should be fine and I would be hesitant on anything but paypal, just because I'm small town and no place easy to convert anything else. I can personally take all credit cards directly, but you may not be able to.
It is certainly worth a try, your luck could be much better then mine, most peoples is.
Had a couple more thoughts- try to get some extra customs forms to have at home, my local post office doesn't have them out, you have to get them at the window slowing things up; consider giving yourself a little padding such as a handling fee over actual shipping costs in case your scale doesn't match the post office; be prepaired for them to use a sniping service and after say how they would like it shipped- be firm on your shipping methods, anything thats takes extra time takes away profit.
once again, good luck, it can be done successfully- don't let my crankiness discourage you; it's more about other things going on now then it is eBay selling.