What you need is so basic and general. I would avoid asking question at this stage.
@14 foot reef already posted a link for you to view and learn. Below also is a really good thread on setting up a marine aquarium. You need to view these.
The Supreme Guide To Setting Up A Saltwater Reef Aquarium Introduction The marine environment is one of the most complex systems on the planet. The aquarium you are about to set up is only a tiny sliver of the vast ocean, but it is nowhere near simple. This task is going to take patience, a...
www.reef2reef.com
Once you go over these resources, you will have great information to start your tank.
Do not cut corner on basic equipment. This will cost you in the long term.
Invest in good
aquarium with overflow, heater with
temperature controller,
refractometer, and
good return pump. Auto top-off, and good sump is great but not essential. Even a small aquarium for sump is OK.
Needless to say, to keep delicate animals, you will need
stability. The above equipment are need to keep the tank stable. Temperature and salinity stable is a must.
What you need is too basic and you don't know enough right now to separate good from stupid advices. Once you know the basic, you will know enough to not follow everyone's advises to the letter. This will cause to ro run in circle and crash your tank. Take everybody advises with a grain of salt, don't blindly follow. Basic marine aquarium keeping information is what you need