The vast majority of common soft corals are pretty easy to keep for a beginner. The first soft corals we had when we started our tank included Red Sea pulsing Xenia, a toadstool leather (see avatar), blue mushrooms, red mushrooms, and various zoanthids / palyzoanthids (aka button polyps, zoas, palys). They've all done well, and we've expanded on to other corals.
Will your tank have a canopy over it, allowing you to DIY your lighting if you wish (allowing for more customization), or are you looking for a manufactured fixture to just plug in and flip a switch?
Will your tank have a canopy over it, allowing you to DIY your lighting if you wish (allowing for more customization), or are you looking for a manufactured fixture to just plug in and flip a switch?