Shipping on Shopify

I just wanted to sell a product for like $15 with free shipping everywhere, but I just realized this might not work so well.
I am new to drop shipping and I don't really know how shipping works.
Or I am just confused

If I sell a product for $15 and I just pay the price of the product + epacket shipping myself (lets say that costs $5) will I always be getting $10 profit?

or

Does epacket shipping only work for USA orders or is it the same rate everywhere?
How do I figure out the shipping cost to other countries?

Whats the easiest way to set up shipping for Shopify?
Im probably missing something obvious, but I am still going through settings on shopify.
All help is appreciated

I hope this will help : https://www.shopify.com/blog/epacket-delivery-explained-everything-you-need-to-know-about-epacket-shipping

U can change the country in aliexpress and see the shipping information for a country u want. Select epacket and see the shipping prices. They are not expensive, maximum is around 1$ i think, but ePacket is mostly used and available for the US.

ePacket supports shipping to 35 countries apart from the USA. It did begin as a fast and cheap shipping solution from China to the USA in 2011. However, since then the list has grown and now includes 35 countries among which are some of the major European countries as well as Canada, Australia etc.

Actually, ePacket is more expensive than $1, so if AliExpress seller has a price for ePacket shipping $1 or less, he's probably not using ePacket, or he already included the shipping price in the price of the product. You can check prices for ePacket on China Post EMS website since ePacket is their service.

epacket rates not equal for every country . you have to get estimation and calculate price based on epacket rate for countries u sell for

This problem also concern me about getting in dropshipping..

#ask
So what kind of shipping that BHW member do..any other option?