If you get any anemone or corals, then you need proper lighting. Also, a lot of anems will get very large, so you need to take that into accout. Bubble Tips can reach 12", and Condys can reach 6". But, if you want something your clowns will host in, then that opens you up to a ton more variety if you ditch the anem. Torch Corals, Zenia, Frogspawn, even Tank Corners and Powerheads can be hosted.
If you would like some lighting advice on you having either a FO, FOWLR, or Reef, then let me know.
And, as stated, filters/skimmers *are* optional, but I would definatley get them here. IMO, any tank larger than 20G should have a skimmer and a good sump. Contact Pasfur and/or SKAustin for help on those, as they have the most knowledge there.
For a substrate, Aragonite Sand would be idea. A Sand bed of at least 3", if not 4" is best too.