1. a VERY good site to start learning japanese sentence structure is:
Tae Kim's Japanese guide to Japanese grammar
the above is a VERY good grammar site, teaching you step by step. in english with proper japanese examples. you can go to page on, and as u learned it continue page to etc...
2. this is a very helpful kanji dictionary:
Kanji details - Denshi Jisho
just put in the kanji and it will come up with all readings and popular conjunctions, as well as all the meanings of it.
3. because you do not have proper classes, it will be hard for you to pick up how japanese people correctly speak and pronounce words. so i would recommend for you to watch japanese drama or anime with english subtitles. one good site i know is:
Watch Korean, Japanese, Taiwanese Drama and Movie online!
you can have a look at the new releases drama, and find good ones.
there are different sites as well, you can find in google.
GOOD LUCK! please try your best!