Photoshop Elements is one way to go, it's significantly cheaper than regular Photoshop, but it's a start. I'd really recommend getting the full version of Photoshop. It's completely worth the investment in my opinion simply because of how
powerful it is. If you're on a PC, talk to any friends who are tech geeks, they should be able to steer you in the direction of getting a free crack version. I used illegal versions for years and never had any issues. PM me if you'd like some
help.
It's totally bad of me to recommend this being a graphic artist by trade, but I feel that software is horrendously overpriced. A friend of my mom's works for Adobe and her employee price for Photoshop is $75. (no, I can't get copies for
everyone. ;-) Sorry if this breaks any rules, but it's just how I feel about it.
Also let me know if you want some pointers in Photoshop, (if you decide to get it) I've been using it for years.
Good luck!