Google has a new guide with best practices for helping advertisers enter international markets and go global.
Don't worry, it's not a big PDF you'll have to download or anything, but a simple help center article, which you can find here.
The guide covers discovering opportunities abroad, connecting with locals, setting up your account for international optimizations, and using automation to scale coverage.
A a very concise way, it tells you what to do and why to do it.
"It’s possible to connect across the globe in an instant. Expanding your business to new countries unlocks new opportunities and challenges for your AdWords account," says Matt Lawson, Director, Performance Ads Marketing at Google. "By understanding how you can prime your AdWords campaigns for new markets, you can expand your account effectively and take your business worldwide."