I'm afraid your aquarium is too small for a tang. In the wild these fish form large schools and roam over large areas to graze. When confined to a small aquarium, they tend to stress very easily to the point of no longer eating and often developing diseases. For these reasons, most people will recommend a tank at least six feet long (about 1.8 meters) for tangs.
Similarly, you need an aquarium about twice the size of what you have for a fumanchu lionfish. They are also difficult to get to feed many times, and once acclimated you would not be able to keep one with shrimp or any fish small enough to fit in its mouth.
Damsels, while extremely hardy are also terribly aggressive and territorial with the exception of the chromis group. A single damsel would likely claim your entire aquarium as his own and harrass any other fish to death. Chromis ought to be in a school which will require a lot of room in your tank, so I wouldn't recommend them either.
As far as lighting for corals and anemones, I would think a 4 or 6 bulb T5 HO
(high output) fixture would work. Metal halide lighting isn't out of the question either. It really depends on what you want to keep and how much you're willing to pay. Good
LEDs are considered the best technology out there right now, but the ones that can sustain corals are pretty pricey. (Do not buy a Marineland "Reef Capable" system or a system you haven't seen in person advertised on the internet- they look like a good value but the feedback I've heard indicates they do not provide very intense lighting and are ultimately a waste of money.)