Hello. I am a Japanese man, teaching Japanese in Japan as a volunteer.
I would like to show you some sites learning hiragana and katakana.
Here is the site you can download "hiragana practicing sheet.
(You need Adbobe Reader to download)
http://minnano-nihongo.seesaa.net/article/218132907.html
あ to そ is here
http://minnano-nihongo.up.seesaa.net/image/E381B2E38289E3818CE381AAE38080E38182EFBD9EE38195.pdf
た to ほ is here
http://minnano-nihongo.up.seesaa.net/image/E381B2E38289E3818CE381AAE38080E3819FEFBD9EE381AF.pdf
まto ん is here
http://minnano-nihongo.up.seesaa.net/image/E381B2E38289E3818CE381AAE38080E381BEEFBD9EE38293.pdf
Here is katakana version.
http://minnano-nihongo.seesaa.net/article/218137160.html
ア to ソ is here
http://minnano-nihongo.up.seesaa.net/image/E382ABE382BFE382ABE3838AE38080E382A2EFBD9EE382B5.pdf
タ to ホ is here
http://minnano-nihongo.up.seesaa.net/image/E382ABE382BFE382ABE3838AE38080E382BFEFBD9EE3838F.pdf
マ to ン is here
http://minnano-nihongo.up.seesaa.net/image/E382ABE382BFE382ABE3838AE38080E3839EEFBD9EE383B3.pdf
All of above can be download for free.
I recommend that you shoud download and printout all of them and practice hiragana and katakana.
After you memorize hiragana and katakana all, then you should go to kanji.
hiragana and katakana are very important to learn Japanese because you can write all Japanese in hiragana or katakana. some hiragana or katakana will be written in kanji. and all kanji can be written in hiragana or katakana. Good luck to memorize them!
Grammar.
I am afraid but I do not know any good site for learners to study Japanese grammar. So, I would like to show you some books.
Minnano Nihongo
http://www.amazon.co.jp/%E3%81%BF%E3%82%93%E3%81%AA%E3%81%AE%E6%97%A5%E6%9C%AC%E8%AA%9E%E2%80%95%E5%88%9D%E7%B4%9A1%E6%9C%AC%E5%86%8A-%E3%82%B9%E3%83%AA%E3%83%BC%E3%82%A8%E3%83%BC%E3%83%8D%E3%83%83%E3%83%88%E3%83%AF%E3%83%BC%E3%82%AF/dp/4883191028
This textbook is very good to study Japanese. Most Japanese beginners use this one in Japan.
I am afraid but I'm not sure it is possible to deliver outside of Japan in this website. But, it is possible, try to use one!
Good luck to study Japanese!