Sorry for my previous bluntness. I still get very angry if somebody becomes so pushy towards somebody who has only joined; your reply gave me an impression of hostility even though it's not actually worded in a hostile way. Also, as to your sarcasm, as I said before, I would like to see Toritoribe give a reply; I know that I can't be trusted too much, so I'd like to see somebody who is willing to spend a little time to give some advice. However, at the first look, it did seem like OP had a better grasp of grammar than me, so, yeah.
"こんにちわ。私は、ルイスです。日本語をならたい。日 本語は毎日ことあたらしい語でストーリをかたい。
そうなんにのてください。:)どうもありがとう。"
I'm on my computer now, so I'm just going to comment on these few introductory sentences. Although it's not bad for a start, as Mike said, it has a few ripples of mistakes. For example, こんにちわ should be こんにちは. Treat the "wa" at the end as a particle. I also do not see the purpose of a comma in between 私は and ルイスです, although for some reason my mind just kinda ignored that comma. As I said before, you likely meant ならいたい, which is the -tai form of 習う, "to learn".
Those are some fairly simple mistakes, and not really critical, but you might want to review them for a while. Also, "毎日こと" isn't exactly proper, I believe; I may be wrong, but that doesn't quite make sense to me. Remove the こと for now; that is used for verbs. In the meanwhile, perhaps add a に in front of 毎日, as that indicates that you are learning new words "IN" everyday.
語 is valid, but when I read that sentence, I thought you meant "new words", so you'll want to use 新しい言葉(あたらしいことば). Sounds more proper to me. BTW if you watch anime or read manga, you'll probably see "物語" a lot. That's one of the words for "story". You also meant 書きたい(かきたい), not かたい (which means "hard"). I understood どうもありがとう but not そうなんにのてください; you'll have to ask someone else about that.
*ahem*
Lengthy "corrections" (quotation because although I used my grammar book as a reference, I don't exactly trust myself too much in fixing grammar) aside, I don't see a big percentage of problems in one category; I understood your statements just fine, but a little refinements in nouns and verb conjugations will most certainly help.
As Mike said, you will want to consider buying another book if you have the money. Although learning Kanji is important in the long run, people will much more appreciate a Romaji user with insane grammar skills; grammar will be much more important in the beginning run. Many books and paragraphs have been written almost without any form of Kanji, and they're still well-made because of their proper grammar.
If you can't dish out the money for another reference material, I have a grammar book here that isn't a textbook but serves quite well as a reference tool so far. It has verb conjugations and definitions, amongst some other fancy stuff, so feel free to send me a private message and I'll try to give you a quick lookup output as soon as possible.
I'm not a bot, and neither are the people at these forums. As much as we'd love helping you out, we'd also love if you could help yourself a bit. So try not to ask "translate this" or "fix this" kind of questions but instead ask questions regarding concepts that you are confused about.
That aside, feel free to bomb away. I hope you feel welcome in the site
There's also a cool random picture viewer at the front page, and it really helps in giving you some images to drool over. Also, you might want to take a look at the rules (They are in the FAQ).
*EDIT* @OP You are new, right? This won't help much, will likely be too advanced or might even demotivate you a bit, but take a look at
動画ニュース連続再生 - NetTV-News on the Web. It's a site that grabs random latest Youtube videos from news channels in Japan and places them in a playlist. The point here is not to comprehend what they are saying (that's for a much later level), but feel free to try to get a hang of the way Japanese people speak, such as the speed and some really common wordings. Another bonus is improving your skill of finding out what is going on simply through visual aid; I can often tell what is going on in the video through the recognition of pretty much 2 words and the video itself, so it's good to know what's going on in Japan, such as the strong typhoon that already wrecked a few places, and also a bunch of car accidents (the other day 6 people died in a single car accident in the highway...really sad...as I remember they were going to the beach, I believe; outing went wrong).