International shipping is tricky, but worth it. We love our international customers and you will, too. Since the rates went up significantly in January, it has become even trickier for us. We have lost money here and there, to be honest, but we feel that is part of doing business due to trial and error. And we have figured out a lot about international shipping this way.
You said you are new, so my first advice is to get a scale so that you can do all of your shipping online - it will save you money each time. Let me know if you need advice on a scale and I can help (convo me) - ours was around $20 and still works great.
Then, I would start small and LIGHT. When we have made errors and not pre-calculated our international shipping properly, we have only lost a couple of dollars. If we started by shipping heavier, larger items, we would have been out a lot more money. We started by offering international only on our items that were under 13 ounces.
Hope this helps a little!