If you are using a PC, I would look into a program called GIMP. It is a free open source photo editing software that is apparently really good. There is a little bit of a learning curve from what I hear, but youtube can surely answer any questions about it! Adobe Lightroom is also a fantastic photo editing program and it is quite intuitive and relatively inexpensive (in photo/video software terms).
I personally use Photoshop (for photos) when I am working on a big project, but otherwise I find that either Lightroom or Apple's Aperture 3 work fine. For video, I use Final Cut Pro X. I think it is a great program and relatively inexpensive for video editing software. I hope this helps!