I'm gonna be that guy that says do what you want. A lot of people will say nems aren't for beginners and should only be added to a mature tank, but I added mine within 2 months and he's still alive and kicking, the only thing I would recommend as far as that goes is ensure you have cycled completely first, and that you can commit to doing the maintenance required to maintain stable parameters. If you answered yes to that, then by all means go for it.
As for corals, zoas and palys for sure, plethora of colors to choose from and they aren't always as picking about water conditions as other corals, also you could shoot for frogspawn or hammer corals if you were interested in LPS, I've had great success with mine, they appear to be a very hardy coral imho, and they add a nice look to any tank. Gsp is almost impossible to kill, its aggressive though so placement is key, igrow mine on the sand bed and trim it back before it reaches the rock work. Shrooms are also sweet corals that come in a lot of different variations and can add extra flare.
Do what makes you happy is the best advice I cab give. Make sure you will smile every time you look at your tank, when you can sit and stare for hours you'll know you've hit the sweet spot and keep going that way! Have fun