Shopify Shipping

I also wanted to ask about the shipping and the international side. Because many people, if they order books from amazon, will be on prime so get free shipping. So i believe there's a place in the settings on shopify that you can say not to charge shipping, but then you have to pay for it. It was a while ago that i could futz around with the shipping a bit more, but now i just have it set in the settings of shopafy on like a pretty sant standard,. Like cheapest rate shipping, and then they get charged based on weight.