I use Pinnacle Studio for editing my videos (also off a Panasonic camera) and writing them to BluRay. I've tried other editing programs but find that Studio is the easiest for editing, inserting titles and transitions between clips (fades etc).
It really depends how "professional" you want your final product to be. People will recommend free software, which is very good, but may not be quite so flexible as Studio or may not write BluRay. You don't have to use BluRay but using DVD instead will lose you some quality (if you're bothered).
You can get trial versions of many products, so I suggest you try some of those and see which suits you best. (The trial versions often write a watermark on the final copy).