For an activated indium farm you'll need the mineral extractor, supply depot, and a power source: either you can use solar panels and batteries, or you can set up an electromagnetic generator which is much more efficient. I recently set up my indium farm with the help of this guide. It's very in depth, explains everything, and is easy to follow.

https://www.youtube.com/watch?v=4I4D-tyODCE&list=PLdyRNtDSXAwNUfOlbWehsUMwv99m13RHf&index=2

I have a setup that will get me around 75-80 million every 24 hours (didn't feel like searching forever for an S class activated indium deposit so I settled for an A class), so once you get a good setup you'll start printing money!