I've always wanted to be a barista.
Kind of like in Starbucks? I love espresso-based coffee drinks!
Yeah, but i'm clueless as to what kind of training I would need.
I believe you have to learn how to use a commercial espresso machine, some being easier push-button machines and others being more involved manually.
That sound like fun. I've always wanted to learn how to do Latte art. 
That would be fantastic! It's quite difficult to do consistently because of the conditions needed for both the espresso and the milk used.
I would be up to the challenge.
Well, you could contact a coffee shop and see if they'll train you. You'll need to be skilled in many things like effective frothing and how to pour the drink.
I heard they have competitions where you can showcase your skills. Is that true?
I personally have never heard of such competitions, but as there are so many baristas (Starbucks alone has over 23,000 locations!), there is sure to be something of the sort.