If you have any test kits, I suggest testing your parameters to see where they are sitting before adding some corals.
Make sure you have proper lighting as well.
Green star polyps, mushrooms, anthellia, zoanthids, Xenia, ricordia, tree leathers, finger leathers, toadstools, protopalythoas... Those are all good choices.
When running a soft coral tank, I suggest feeding with phytoplankton at least once a week and make sure you keep an eye on calcium and alkalinity - especially when adding leathers.
Happy reefing.