My friend , you start from wrong question.
First of all to build the PVT model you need at least to know what buttons to press on software you will use if you dont care about theory but this is wrong way
If you like to read I will advise to read first what is PVT and phase behaviour theory adn then go to practice
If you are more practic rathere that theory guy than you are welcome to Elipse PVTi techinacl decribtion chapter 8 where you will find some amust theory and then how to section
Regards