This is basically the finished project, as it has been a while and I forgot to take screen shots. However, I can still illustrate the process. The first thing I did was created a basic plane. Then using subdivision surface, I made 5 cuts. Next, I took the plane and added a sub-surf modifier onto it. I then created a material for the ground and gave it a dark brown, non-reflective color. Once that was finished I created a texture for the displacement modifier. Now, I don't remember exactly what settings I adjusted to get the rolling hills look.
In this image you can see that I cut away the majority of the original plane. This lightens the load on the computer quite a bit and since the audience only sees what the camera sees, then it is not required to have the rest there. Once the displacement modifier was all tweaked, I moved on to the grass. Using hair particles and tweaking the settings once more, I created the rolling grass-covered hills you see here. I will do a more thorough walk through later. Enjoy!