Off to Amazon for lighting. DD might get a sunburn if she stays down there too long!! Gunna make Clark Griswalds Christmas display look like a birthday candle.
We still feel the GoPro Hero 3 and 3+ cameras are the best fit for capturing baseball and softball video. First and foremost, they are rugged enough to handle the extreme environment that is the baseball/softball venue. This includes several different case options that can be totally air and water tight if you want. This will keep the rain out on wet days and dirt/grit out on dry windy days. Additionally, they are small enough to easily carry with your existing gear. The high end device can be expensive ($400), but the medium to low end devices go down from there ($300, $200). Very good cameras and one of the only ways I know of to record the entire field; from foul pole to foul pole.
As for software, nothing additional is "required". Mac has their own video tools and Windows has theirs. If you want to get to the next level, investigate Adobe Premier and Premier Elements. Great video software allowing you to add some great effects as well as simplify your post processing.
Lastly (DISCLAIMER: Shameless, self-interest plug): When you are ready to mount that GoPro to the fence, look us up. We make a rugged bracket that is designed to mount small cameras, such as the GoPro, to a chain link fence: http://www.lynkspyder.com