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@Kage, you've got it pretty much right. A few notes: "Ustedes" in Argentina may or may not be formal, depending totally on context. To complicate things a bit, the informal imperative of "ir" is "andá", but the formal way is "Vaya", as in Iberic Spanish. E.g., to say Go to the library you either use Andá a la biblioteca (informal), or Vaya [usted] a la ...

I learnt Spanish in Argentina so to me the vos conjugations come naturally (and they're actually easier IMO =P). But I think that you pretty much already undersand how to form the present indicative singular second person in Rioplatense Spanish. As you said, remove the final -r, replace it with -s and shift the stress to the last vowel. Make sure to ignore ...