In my personal opinion, and this isn't true for anyone because everyone learns differently, it may help you and it may not. What I would recommend as a good way to learn the language is to get a textbook of some kind (like Genki/げんき) followed by a grammar/verb book (I have Oxford's Guide to Japanese Verbs), then get a book for learning the kanji efficiently (I am using Remembering the Kanji with Wakan/Internet supplement). The language is a huge task to take on, but with dedication I'm sure you can find your way on the road to victory. I also think going with the method I said will save you time in the long run, and give you more of a vocabulary so you can read more manga without looking up each word and sentence!
Also, if you are on a budget, you can find MANY books on the Internet, Google is a great resource.