Buy the book Japanese Grammar (Barron's Grammar Series) Carol and Nobuo Akiyama and memorize its contents. This book is a very valuable resource and covers most of the basics of Japanese Grammar. Here is a link .
While reading through the first book here is a list of resources that you should download.
Tagaini Jisho- This is very useful when first learning the kana and will remain a valuable resource as you learn the kanji.
Anki- A very good flashcard program. The flash cards that will be most helpful are
JWPce- This is a Japanese word processor and is also useful as a dictionary.
After learning the basics of Japanese Grammar from Barron you should learn the hiragana and at least familarize yourself with the katakana using Tagaini Jisho. Also use the Anki flashcards Master Hiragana (with audio) to familiarize yourself with the pronunciations more.
You should also try to expand your vocabulary using the Anki flahcards Genki I Vocab Master Deck. This also has audio so you can improve your pronunciation and listening comprehension.
You should also introduce yourself to some kanji using the Anki flashcards All Kanji for JLPT 4. Use Tagaini Jisho as a resource for breaking apart the kanji to manageable parts and for practicing stroke order.
Make sure not to get stuck on slang work with what you know and expand gradually from there. Most of the Japanese subtitles can be viewed as a text document so you can copy phrases or words from there. You can view Japanese Transcripts for some anime on http://yagokoroshi.wordpress.com/. Viewing this in Firefox using the add-on Rikaichan would be the most efficient way, I think. For grammar that you do not know use http://ejje.weblio.jp/.
For a final step. Increase your knowledge of grammar using Makino and Tsutsui's A Dictionary of Basic Japanese Grammar, A Dictionary of Intermediate Japanese Grammar, and A Dictionary of Advanced Japanese Grammar. After reading through the grammar points use the books index for quick review. Another valuable website that I forgot to mention is http://nihongo.j-talk.com/kanji/ this website has a very good dictionary and can convert Japanese with kanji into just the kana.
That should be a complete list of resources. I am not fluent in the language yet but I plan to use these resources to become fluent in the near future.