Ni hao! 你好!

你好!

我叫劳拉, 我是 西班牙语 我想学习中文 ,但这是非常困难的 . . . 这是困难的，因为它是从我的语言很不同 .
I'm Laura, I am spanish I wanna learn chinese, but this is very difficult... This is hard, since it very different with my native language.

*西班牙语 should be 人（people, in english is same word but you have to spell it out in chinese.)

*这是困难的，因为它是从我的语言很不同. should be 它很难，因为它跟我的语言很不同。从means from, but only use for location or place.

我叫劳拉，我是西班牙人，我想学中文，但这是非常困难的．．．它很难，因为它跟我的语言很不同。

Wo Jiao Laura，Wo Shi Xi Ban Ya Ren，Wo Xiang Xue Zhong Wen，Dan Zhe Shi Fei Chang Kun Nan De... Ta Hen Nan，Yin Wei Ta Gen Wo De Yu Yan Hen Bu Tong。(Pinyin)

我是我很想去中国! 那会让我很高兴, 是珍贵的.
I am and I really want to go China! That will make me very happy, it's valuable.

*那会让我很高兴, 是珍贵的. should be 那我会很开心，那很棒。

You could remove 我是 in the beginning. It's alittle weird... you could say:

我很想去中国，那我会很开心，很棒。

Wo Hen Xiang Qu Zhong Guo，Na Wo Hui Hen Kai Xin，Hen Bang。(Pinyin)

这对我来说非常难写的文字! 
Chinese for me is very difficult to write!

*haha,“write” in english is to make a sentence but in chinese... are u really want to “draw“ :P 

You could say:

中文对我来说真的很难！Chinese is really and very difficult for me!

Zhong Wen Dui Wo Lai Shuo Zhen De Hen Nan! (Pinyin)

我不能多写，哈哈
I can't make it long, haha 

You could say:

我不能多说，哈哈

Wo Bu Neng Duo Shui, haha (Pinyin)

我需要很多的帮助, 我希望你能帮助!
I need many help for this, I hope you could help!

*帮助 should be a verb in this sentence because of "能" (could),  it also could be a noun but in other sentence.

If you use 帮助, it will be alittle weird. Chinese people might think: ok, but what could I help you with?

You should add a noun after the verd, or just make it short. "帮"

It would be better if you say:

我需要很多的帮助, 我希望你能帮我! I need many help for this, I hope you could help me!

Wo Xu Yao Hen Duo Bang Zhu，Wo Xi Wang Ni Neng Bang Wo! (Pinyin)

谢谢! ^_^

Thank You! ^_^

CAUTION: Pinyin is only defined the pronunciation of the character, do not try to spell the word by memorize it! Owo)/