One thing I did while I was learning Spanish was to read the early Harry Potter novels (the ones which were actually still suitable for younger children) in their Spanish translations (I had read the English versions earlier). It will give you some vocabulary you're never going to need (witch, wizard, and the like), but at least it's a fairly simple way to get the hang of sentence structure and things along those lines. And you'll roughly know what's going on already if you've read the books in English, which can be a big help.