Basically a scanner is a means of getting images into a computer.
It may be used with Optical Character Recognition software to read a scanned page into a document which can then be manipulated in a Word Processor on the computer.
It may also be used as a photocopier, by placing an image on the scanner bed, and printing it out using the printer attached to your computer.
So far as actually setting it up is concerend - was there not a manual supplied with the equipment? If so, there is usually a step-by-step procedure which is easy to follow. Do FOLLOW THE SEQUENCE IT TELLS YOU! if you try and do things in the wrong order it can be a total disaster!