How to speak in latin american spanish 'vos' instead of 'tu'……?

I learnt the normal Spanish at high school, and am going to Paraguay in 2 months time.
I only just discovered that Paraguayan speech is different to common spanish…

What does i have to use ‘vos’ instead of ‘tu’ mean?? do i say como estais? instead of como estas?

someone please explain!! >.<

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