Will somebody tell me things that when u have a girlfriend u will talk about please help me ?

Sorry I didn't understand your question, do you mean, will someone tell you things to talk about with a girlfriend?

Just like any other friend... ask her how she is doing, how her day is going? Ask some questions to find out what you may have in common... same interests,activities,etc. It could be about a great movie, funny event of the day, on and on.
Don't get hung up on trying to find the perfect subject or what you think they want to hear. Relax, be yourself, have fun... tell her she looks pretty today, hold her hand and kiss her every chance you get! :)

Oh and no text speak on this forum please... comprendé!? ;)

Ironhide has great advice, always have that one deal breaker question ready and waiting in your head.. one they can't refuse to answer only yes or no to, I call them open ended questions. You could say "how are you, tell me about your day"...