I have a job in America. Whats the fastest way to get work permit.?

It will be VERY difficult to get here. Since this is not a 'special skill' you cannot be transferred on an L-1 visa. You also do not qualify for H1-B status. If you have $250,000 or more to invest in a business, you can apply for an E-class visa, but I suspect that doesn't apply either. In which case, the only way they can get you here is to advertise the position for several months, AND interview candidates, AND keep records of why those candidates were not up to the job. If they genuinely cannot fill the position within that time using an American citizen, then they can offer the job to you. Doing anything else (like advertising but not interviewing, turning down qualified candidates etc) will result in no visa for you, and possible prosecution for the company.

If you have a bona fide employment offer to work in USA, the best bet is to let your future employer obtain a "work visa". If I understand correctly, your employer will assume responsibility to renew the visa as needed and after five years of continuous employment you may be eligible for a resident visa. I have a niece in similar conditions: she has been in USA for 13 years with a student visa; has not been able to secure a resident visa; but recently got a job and her employer is doing exactly what I telling you.

You don't say what country you're from. Some countries you don't need a visa at all for 90 days. If you have an employer he can sponsor you and that starts the green card. While that card is started you're eligible. But, I'm astounded that now they're hiring offshore to bring in security personnel. That sounds very suspicious. Many security jobs require a clean credit history.