This one is easy. I would simply do what they tell me to do. After all, since they came back to see me, it’s certainly because the future me sent them back in time.
If it wasn’t me that sent them back in time, then it’s probably a set up, and I would be powerless to resist it.
If they insisted on my ordering them around, I’d have them bring back a copy of their Wikipedia from 50 years in the future, and then I’d try to use the rest of the time to figure out the physics behind time travel, and see if I can’t get plans for a time machine.