Specter: If you're attending a university, you might be able to buy a used 1st-year Russian grammar textbook quite cheaply, even if you're not formally enrolled in a Russian course. And I highly recommend acquiring a 1st-year college text on Russian -- usually they're better organized than any of the "Russian for Dummies" titles that you might find in a regular bookstore.

Also, if you haven't really studied other foreign languages in any depth, I recommend that you carefully read this Wikipedia article on Latin grammar -- it may help you better understand threads about Russian grammar on this forum. (Not that Latin and Russian are particularly similar to each other -- it's just that they're both "highly inflected Indo-European languages," whereas English is also Indo-European, but only slightly inflected. If you already have a thorough understanding of what "inflection" means, then you can probably skip that Wikipedia article... but if you're not sure what it means when I say that "Russian and Latin are more inflected than English," then it's extremely important to digest the fact that Russian (and Latin) use endings/suffixes rather than word-order or auxiliary verbs to express the difference between, for example "The girl loves the farmer" and "The girl might have loved the farmer."

So, don't try to memorize the article about Latin grammar (since the exact rules are different in Russian), but do skim through it several times and try to get the general concepts (because in some ways Russian is more like Latin than English).