what do i need to get a work z visa and how much does it cost here in colombia ?

It costs around 75000 pesos. First, you need to find an employer. He/she should help you acquire the work permit (Alien Employment License issued by the Ministry of Human Resources and Social Security of the PRC). Then you can apply for the Z together with othe required documents:

1. your passport with a validity of six months at least and one blank pages.
2. filled application form affixed with a recent passport size photo.
3. invitation letter from the Chinese duly authorized unit.
4. work permit.
5. original diploma and a copy of it.
6. original and copy of forienger physical examination record.
7. personal statement.