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The Irish/Welsh accent is probably my favorite. There's something incredibly funny about it, plus it's fun to talk in if you know how to do it.

The difference is pretty easy once you understand it. They're -- the easiest to learn. Simply a conjunction of "They" and "are" Their -- When you're talking about something "They" have possession of, eg. "Their dog" or "Their car" There -- Anything else that doesn't fit these two, mostly used as a location word.

Maybe, but maybe not. Most people in different countries learn to speak English for trading and other basic things. Right now however, more people are completely fluent in Mandarin than anything else. Overall, it will take some time to see.

Speaking and listening are definitely the hardest. In reading and writing, you have plenty of time to figure out what to say. However, when having a conversation, you need to be quick on your feet and that can really throw people off.

It's pretty hard to pinpoint the basics of what you'd need to know; I would just use a free language learning site like Memrise or Duolingo to learn all of the basics.

While this is a great idea, one big concern (and one reason this really doesn't happen) is money. The schools nor the teachers have enough money to just go somewhere where they speak that language (unless it's in at least a 30 miles radius, and even then it would be hard). I'm not sure if it works that way in other places, but that's primarily how it works here.