I can't answer for the breakdown, but my guess would be Pasto would be more important. Ideally, all of your people should have basic survival language skills in both. BTW, "survival" level language skills vary with the complexity of the language: in English, it's about 300 words with little or no grammar.

You might want to take a look at this and see if it would be useful (I've heard some pretty good things about it). Last I heard, it's about U$1200 per network.