hanened

I have a job lined up in yanbu, Saudi. I need a work visa; working with Hanwha, in Korea. They have a project there and many folks working there. I"m from USA and need to know the work visa process. Do I go there and then see what I need. Do I need to process outside Saudi ? What to bring to Yanbu for signatures by local offices; first or later. Any assitance is apprecited. I"ll be back in Thailand in 20 days and they have a Saudi Embassy there if thats any help for papers processing.