Linux Partition and Virtual advice and help needed

I am using Linux centos on all my machines and recently I cloned a 36 GB to a 73 GB hard drive and now have a partition and file system around half the size of my new 73 GB hard drive. I need this partition and file system be resized to utilize the whole hard drive. I think it’s a very simple command but I don’t know the command since I am quite new at using Linux. I can give SSH log in to this machine or I can put this hard drive on a another machine fully loaded with every cantos software packages available I had during installation. This may make it easier to partition since it’s not the boot disk. I need to learn how to do this myself so I need emailed the commands method used after this task have been completed. I also need to get advice and possibly have someone set up Virtual servers on my Linux machine and a way to clone contents of Virtual servers to other virtual servers on same machine. If setting up a couple Virtual server on my machine and showing me how to do it is included in your bid let me know. Also if you have experience with clustering Linux servers put that in your bid. This is a future project.