OOP in C++ and overloaded operators << & >>

Hello

Is there anyone who can answer some questions regarding C++ OOP? What I'm, trying to achieve is that I have class client file with main function which instatiate object from class "fisrtclass":

#include "firstclass.h"

firstclass dataArray[10];

then its opens the file :

in.open(fileName);

and reads from file straight to:

in >> dataArray[count];

-------
At this point I need a hint. How can I futher manipulate data input from this file. For example I need just first three words and so on. How to create overloaded operator>> for firstclass. What I need is that if my file contain:

string1 string2 string3
string4 string5 string6
 
so my:
dataArray[1] = {"string1","string2","string3"}
dataArray[2] = {"string4","string5","string6"}


Can anyone push me forward a bit? :-) please ask me question if my scenario is unclear to you.

thank you