There's a cheap little program called VideoPad that I used for a little while. It's a big step up from iMovie or Windows Movie Maker, while still being very user-friendly. Jumping into programs like Premiere or Final Cut will take some training, but there are thousands of online tutorials; everything from the basics to all the cool 3D motion shit, color correction, all sorts of stuff. I use Premiere and After Effects mostly, sometimes some Illustrator for logos.