Just based on the frontpage you linked I have the following remarks:
light conditions on the field
All pictures, except for the B&W versions, are taken in bright sunlight. Almost no clouds on all these pictures. This is the available light on the field.
Bright sunlight gives harsh shadows and high contrast pictures. This definetely is the first step.
colorful subjects. Red, green, blue and yellow, all primary colors are seen in these pictures. Choose subjects with these brights colors. Thanks to the direct sunlight these colors are even brighter.
For post processing it's not really what tool he uses that is important. It's rather the technique you have to look for. Start by capturing your images in RAW format.
In some cases he seems to be using HDR and a very soft approach of the Dave Hill effect. Also search high pass filter tutorials.