Help with current set up

I'm set on doing some filming this year, and making some videos. I haven't done any wake filming before and I need some help. Fortunately, I have some decent equipment I aquired a few years ago which has already got me a good start.
I have a Canon Gl-2 which I have had for the past few years but haven't really used much. I know that it's not a top of the line camera but it should get me some decent quality stuff, I think? I also bought the Raynox fisheye for it awhile ago.
Now here is where I need the help. The stuff that I need would be an underwater housing and decent enough editing software. I believe the Epic housing kit can be had for less than 400 dollars after some of the research I did. Which will probably be my choice since I'm trying to do this on a budget, Unless someone else has better suggestions. And as for the editing program I remember back a few years ago Adobe was the program to use. But I also remember it's a very expensive program that's pretty complex as well. What is the best bang for my buck I can get with editing software? Any equipment I forgot or tips would be appreciated as well. Thanks.