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I got a 50gal. tank a little while ago and i want to make a very real looking setup but i dont know what to use to make it. please help me

Maybe add a few plants and river rocks. Some guppies and ghost shrimp probably wouldn't hurt either.

What are you planning to use for a filter and heater?

Make sure you have all the important stuff before worrying about the decorations.. and then take a look at the gallery for how some here have decorated their tank. I used to be all for the most natural looking tank, trying to mimic nature, but that soon got to be a true pain, all the rocks and the "stuff" that collects in there and the "decorations" that took up valuable swimming space.

As I said, just take care of the essentials first

you may be interested in this page on the site:

Cleaning, other considerations