Looking at your listing again I would say you're doing just fine. Free shipping is a huge plus,it will get you far more bids from a wider audience. I think you'll do very well here. Quick delivery is also a huge plus. I wish you all the best. :) I will put in a bid to get things rolling,I could use these :)
I've been through that learning process myself,Here in Canada postage is so expensive.I sent a bluetooth headset from Ontario to Alberta and it cost me over $9.It's usually less postage for me to mail to the US.Having said that,I will still offer free shipping for two reasons,it usually brings more bidders,and it's something I look for myself.More and more people are offering free shipping to Canada,that allows me a wider choice of items to bid on.Have a great day :)