Zoa, mushrooms, and other soft coral like the kenya tree coral and xenia are all easy beginner corals. They are easy because, since they are soft, they don't produce calcium skeletons, which means you don't have to worry about testing for and dosing alk/calc/mag. The only downside to these corals is that sometimes they grow TOO well and end up smothering corals that don't grow as fast(like hard corals), so keep that in mind when you place them. You want to give some space around the hard corals(or where you plan on placing some hard corals in the future).
When you have decided you are ready for hard coral, things like brains, candy canes, and euphyillia are all good beginner LPS. With only one or two LPS, you will probably be able to get away with just doing weekly water changes, but you can start getting your feet wet about learning about the relationships between calcium, alkalinity, and magnesium, and how to properly dose for them.
Peace,
Jesse