RVE for a composite material

Hi everyone

I am fairly new to this.  I am doing my masters in nanocomposite hybrids.  I wanted to know how to do an RVE in ABAQUS.  I only started using abaqus this year and have done very basic models.  I also just started Fortran90 and would like to know how to use the subroutines.  

If anyone can assist me in simulating an RVE with just a basic fibre reinforced polymer that would help.  The goal is to eventually model a nano hybrid. 

cheers