What kind of training should I get to speak like a lawyer?

How can I become as articulate as the great debaters?
I am watching this movie right now and I like the way they speak.

I would like to have a career where I will need to argue for things whether it is law, advertisement, sale etc...

I am an international student but I speak English fluently.There is no debate team in my school, so I can't practice or go to muck trials.

I would like to be able to enunciatemy thoughts freely even In the most unexpected circumstances.
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First it is called "Mock" trials. Secondly, the word is spelled "enunciate" and is not being used correctly in that sentence. Best practice is learning how to read, spell, and write correctly. Then apply that in your daily conversations.
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You cant articulate in a confrontation unless you actually attend
classes for law students because law has a broad subject matters
and you must have legal mind to argue. on line school I think is not sufficient to observe deportation of a lawyer that is at least portrayed by law student during mock trial. To study law is worth the trying instead of thinking how it is done or wondering what is our purpose in life.