Welcome to FT, zzzZZZzzz. The vast number of departure city options available to you make it difficult for FT'ers to make a recommendation to you, but you may find using the flight search on starallance.com useful for discovering all the possible options.
Marry the options together, look at the earning tables to see what fare classes earn 100% in Y, and then start pricing! As airline websites aren't normally good at offering anything other than either lowest fare or flexible, you may need to call them or (more easily) visit a travel agent to get booked into the lowest full mileage earning fare.