Here is a list of what you will need to get started, this is all you need, if you end up spending thousands you can bet you will regret it in the end.
First and foremost, decide what kind of fish you like. Do you like fish that stay small or do you like fish that grow to be huge and will require a huge tank.
Tank
sump
heater
return pump
hydor circulation pump
skimmer
sand if you want, some ppl do not use sand
rock, base rock or $$$$ genuine ocean live rock (live rock is not a requirement, ppl think it is but it is not). If you dont want to buy rock now you can skip it, read up on the curing process of rock later on and just cure your rock properly before adding it to a tank that already has livestock so you dont end up killing your stuff.
Your lights are based on your coral preferences.
fish only you can get away with home depot flourescent if you want to.
Soft corals and LPS do not require expensive intense leds and especially do not require metal halides.
If you prefer SPS corals I suggest you do a lot of reading on SPS corals and be prepared to spend a lot of money. FYI, most people that jump into SPS corals end up quitting the hobby within a year. SPS is truly the experts coral, equipment and care are like having a chld that never grows up.
My personal opinion is to setup the tank with the CORE equipment, decide if you like reef safe fish or non reef safe fish and begin with fish.
If you you like reef friendly fish then as many many months pass by you can decide which route to take with your corals and other inverts.