determine what sort of editing you want to do - minimal, on individual shots or on huge numbers in a hurry.Do you intend to experiment with special effects and creative editing. Do you enjoy editing? Do you want to produce big pictures to frame and put on your wall, perhaps with a nice boarder and a caption? Will you be turning pictures into Christmas cards and similar?
In other words, work out just what you need in terms of editing power.
And then get Elements 9. It costs around £50 -£60 and will do everything you need to learn the basics. Think of in as being like an entry-level dSLR. You can produce stunning results if you take the time to learn how, and it will pretty soon indicate if you need more than it offers (unlikely for a while), and them move up a notch if you need to. In the mean time, it hasn't broken the bank.
There is a free 30-day trail if you go to the Adobe website, but get a good manual (try Scott Kelby) before you download it, or, and this is a promise, you'll get confused and annoyed.