Age, Job

There are pinyin fonts available  ... easiest is to use pinyin input for hanzi; then if you need it hanzi --> pinyin with tones.

wo er shi ba sui (I am 28 years)
我二十八岁了 Wǒ èrshíbā suìle

chu ci jian mian hen gao xing renshi ni (nice to meet you for the first time)

初次见面；很高兴认识你。chūcì jiànmiàn; hěn gāoxìng rènshí nǐ.

wo shi yi ge gong cheng shi (I am an engineer)

the article is not used, not required except for emphasis, normally.

我是/当工程师。Wǒ shì/dāng gōngchéngshī.

wo zhi zuo (or zao) ji qi ren (I make robots)

制作； 制造； zhìzuò; zhìzào

Problem with pinyin!  Just make 只做 or Manufacture 制作? 

Age, Job
wo3 er4 shi2 ba4 sui4 (I am 28 years)

chu1 ci4 jian4 mian4 hen3 gao1 xing4 ren4shi2 ni3 (nice to meet you for the first time)

wo3 shi4 yi2 ge4 gong1 cheng2 shi1 (I am an engineer)

wo3 zhi3 zuo4 (or zao4) ji1 qi4 ren2 (I make robots)

Good job,Casey.

Age, Job

wo3 er4 shi2 ba4 sui4 (I am 28 years)

chu1 ci4 jian4 mian4 hen3 gao1 xing4 renshi4 ni3 (nice to meet you for the first time)

wo3 shi4 yi2 ge4 gong1 cheng2 shi1 (I am an engineer)

wo3 zhi4 zuo4 (or zao4) ji1 qi4 ren2 (I make robots)