Add me to Skype. 我到Skype. Wǒ dào Skype.

大家好
Dàjiā hǎo
Hello everyone

我是莫塔亚历山大·莫塔 

Wǒ shì yàlìshāndà·mò tǎ
I am Alexander Motta

我的姓是莫塔
Wǒ de xìng shì mò tǎ
My Last Name is Motta

我的名字是叫亚历山大
Wǒ de míngzì shì yàlìshāndà
My First name is Alexander

我想学讲学普通话
Wǒ xiǎng xué jiǎng pǔtōnghuà
I want to learn to speak Mandarin language

我能会说英语
Wǒ néng shuō yīngyǔ
I can speak English language

我们可以教对方互相帮助学外国语啊。
Wǒmen kěyǐ jiào duìfāng
We can teach each other

我的Skype ID是：alex.m.motta.cissp
Wǒ de Skype ID shì: Alex.M.Motta.Cissp
My Skype ID is: alex.m.motta.cissp

加入我的Skype和，说“iTalki.com”语言伙伴。
Jiārù wǒ de Skype hé shuō “iTalki.Com” yǔyán huǒbàn.
Add me to Skype and say "iTalki.com" language partner.

我用“GoogleTranslate”，以帮助中国的我写这些汉字。
Wǒ yòng “GoogleTranslate”, yǐ bāngzhù zhōngguó de hànzì.
I used "GoogleTranslate" to help with the Chinese Characters.

我知道的语法错误因为GoogleTranslate的监守 语法是不对的。
Wǒ zhīdào de yǔfǎ cuòwù GoogleTranslate de jiānshǒu
I know the grammar is wrong becuase of GoogleTranslate

大家好，我是莫塔亚历山大。 我姓莫塔。名字叫亚历山大。我想学普通话。我会说英语。我们可以互相帮助学外国语啊。我的Skype ID是：alex.m.motta.cissp。加我的Skype,说“iTalki.com”语言伙伴“。我用GoogleTranslate帮助我写这些汉字。我知道因为GoogleTranslate语法是不对的。

I am not a native speaker, but I've been learning quite a while, so I thought I would try to help you. Im sure a native speaker can give you some better translations and corrections though.

Add me to Skype. 我到Skype. Wǒ dào Skype.

大家好
Dàjiā hǎo
Hello everyone

我是亚历山大·莫塔
Wǒ shì yàlìshāndà·mò tǎ
I am Alexander Motta

我的姓是莫塔
Wǒ de xìng shì mò tǎ
My Last Name is Motta

我的名字是亚历山大
Wǒ de míngzì shì yàlìshāndà
My First name is Alexander

我想学讲普通话
Wǒ xiǎng xué jiǎng pǔtōnghuà
I want to learn to speak Mandarin language

我能说英语
Wǒ néng shuō yīngyǔ
I can speak English language

我们可以教对方
Wǒmen kěyǐ jiào duìfāng
We can teach each other

我的Skype ID是：alex.m.motta.cissp
Wǒ de Skype ID shì: Alex.M.Motta.Cissp
My Skype ID is: alex.m.motta.cissp

加入我的Skype，和说“iTalki.com”语言伙伴。
Jiārù wǒ de Skype hé shuō “iTalki.Com” yǔyán huǒbàn.
Add me to Skype and say "iTalki.com" language partner.

我用“GoogleTranslate”，以帮助我写中国的汉字。
Wǒ yòng “GoogleTranslate”, yǐ bāngzhù zhōngguó de hànzì.
I used "GoogleTranslate" to help with the Chinese Characters.

我知道的我的语法错误是因为GoogleTranslate的翻译问题监守
Wǒ zhīdào de yǔfǎ cuòwù GoogleTranslate de jiānshǒu
I know the grammar is wrong becuase of GoogleTranslate

     Well Done!!