Kanji-A-Day.com - Learn Japanese Free
Since you don't have much material, the above website is a must. There are many many sites on the internet that explains the grammar, you just have to look for them yourself. Here are a few links from me:
Wiktionary, the free dictionary
Japanese language - Wikipedia, the free encyclopedia
Japanese grammar - Wikipedia, the free encyclopedia
Japanese counter word - Wikipedia, the free encyclopedia
Hiragana and katakana drill, learn kana fast and easy!
Yamasa Online Kanji Dictionary
Kana is pretty simple to master, you should do it with a few days of hard work. Don't be too hatsh on yourself, and remember that learning takes time.
Also try to find japanese media, you will pick up and remember alot from there, also useful to see practical use of grammar and stuff, makes you remember it better!