well, i'm not familiar with that particular model of tank, but if your going from a fresh tank to a salt tank you are gonna need:
Salt mix
ro/di water
sg or salinity tester
new substrate
ditch any filters you have now
and a whole new set of test kits specifically for salt water
the 4 you pretty much gotta have are:
Ph
ammonia
nitrates
nitrites
you dont have to have a sump, but i sure do think it makes for an easier system to maintain(more water volume makes things happen slower, and thus you have more time to fix them if something is wrong) if you choose to run a sump you will need some way for the water to get out of your tank and down to the sump, this can be by drilling your existing tank, by adding a hang on back(hob) overflow, or you could position the sump above the tank, and let gravity bring the water back down to the tank after its pumped up to the sump(this is a risky move and has special considerations)
live rock is something that you will need, but to start out, you can start with less and add some each paycheck, that way you dont have to drop so much cash all at once.
As for the lighting, that kinda depends on what you are planning on keeping in the tank. If you're only gonna have fish, and critters(crabs and things) then you just need enough light to see everything well, but if you plan to get into corals(and you shouldnt actually get any untill your "salt" tank is mature(at least 6 months, but more like a year)) then you will need more light. How much kinda depends on what you want to keep, but a basic # to kinda start with is 5 watts per gallon of water(ballpark). Then there are metal halides, actinics, t5's cf's and all maner of different kinds of light, that i just really cant go into cause i just dont know your tank or your goals...
Hope that gives you a short list of where to start.