Danash

I wonder if you experts could help me. I am planning a trip for next year with my SO looking to visit South America. I am based in Dublin and would look at an itinerary like this....booked on miles.

DUB - Rio
Rio to Buenos Aires
Internal flight to Iguasu falls
Onwards to Lima
Lima to Havana
Havana to Cancun?
Back home to Dublin

Is there a special type of award ticket for a trip like this or would I have to book individual trips ?

I'd like to book business class on the long hauls but am happy with economy on the shorter trips. I have about 500K miles in the bank.

Would I be better starting from Madrid on Iberia ?

Any help or guidance appreciated....