There are quite a lot of Spanish vocabulary resources on the net.
You may already know that learning a new language implies grammar, of course, but it would also be a good idea if you could also start learning new words. So, here is a list of free Spanish language vocabulary I have found on the internet. The ideal method would be learning one or more new words per day, but no need to say this depends on the free time you have, among other reasons. The best thing about all the sites below is that you don't have to pay for the information, it is totally free, so try them and chose the one you find more interesting.
As a complement, you maybe interested in The Big Red Book of Spanish Vocabulary: 30,000 Words Including Cognates, Roots, and Suffixes (Big Book of Verbs Series)
These sites are just some examples, as there are more on the internet. So, here's a tooll to can find useful if you want to learn more Spanish vocabulary. Enjoy!