how easy is this to and where can i send them via the sim card to anywhere in the world ?
What hardware are we talking about? Link?
i dunno yet as i dont have a particular unit in mind
Yes. It's the same as sending an SMS from your phone. Ok, a little more complicated as the phone makes it easy for you, but yes, you can send a text to anywhere in the world. And at the risk of being pedantic, it's the GSM standard you would use, not GPRS, which is internet connection.