Europe and Australia are on my list of places to see, and why not have it be a cruise. My issue is, I'm fine booking any local flights within the US, but when it gets to international travel, I'm at a loss...

 

What are your go to sites/airlines for international travel, as well as any tips... I know their luggage requirements are very different, then there is always Visas if they are needed. Any help is greatly appreciated!