It sounds like a nice set-up! You should add 1 or 2 females to the tank, as the male will annoy one female to breed often, and having several males in one tank can result in fights. I would not add tetras to the tank, because they are VERY nippy and would probably go after the male's tail. Mollies, Platies or Guppies should work well. If you want to have permanent fry-eaters in the tank to get rid of the fry being produced, add a few Dwarf Cichlids, Angelfish, Catfish, Pygmy Cories, or Barbs. Swordtails are also known fry-eaters, so if you leave the adults in they'll most likely eat their own babies -_-... about feeding, they might still be settling in. Give them some time to get used to the foods you're feeding, as they could've been fed differently before you got them.

For names, I think tropical drink names would be cute... like, Daquiri or Chi-Chi and Pina Colada, or something