Setting up my 190gal (still a newbie)

[TheReefGeek]

You should at least get the center brace installed again, and possibly get the tank re-siliconed if it hasn't ever been done on this tank.

Is the tank drilled with an overflow? If not you will need an external overflow in order to use the sump.

For lighting, it depends on the corals you want to grow, if any. If you are thinking fowlr, just go with NO lighting, that is just normal fluorescents in lighting strips available cheap. Use a coupld actinic/blue tubes along with white ones for a nicer color. You could upgrade it later if you want to grow corals.

The best advice I can give is don't buy anything, not one piece of equipment until you have your entire setup planned out after doing tons and tons of research. Post lots of questions, read as much as you can find, then research and plan some more.

You can find good deals on used stuff here too, once you know what you need/want.