Just starting out...

Nǐ hǎo. Wǒ jiào john. Wǒ shì yīngguórén. Nǐ jiào shénme míngzi?

Just starting out...

Nǐ hǎo. Wǒ jiào John. Wǒ shī yīngguórén měiguórén. Nǐ jiào shénme míngzi?

By saying that you are yīngguórén 英国人, you're saying that you're from the UK. I'm assuming you want to say that you're American, so I changed it to měiguórén 美国人. Nice first try!

Just starting out...

（Niǐ） hǎo. Wǒ（ jiāo ）john. Wǒ( shī)( ying)gúorén. Nǐ (jiāo) shénme míng(zi)?

   nǐ                     jiào                   shì    yīng                jiào                          zì

 (虽然标

第三声，

可是念

第二声） 

Just starting out...

Niǐ hǎo. Wǒ jiāo john. Wǒ shī yinggúorén. Nǐ jiāo shénme míngzi?

nǐ hǎo, wǒ jiào John。 wǒ shì yīnɡɡuórén ，nǐ jiào shén me mínɡ zi ？