Bism Illah wa as salaamu alaykum.
Here is a list of wonderful blogs that are all about living and working in Saudi Arabia.
Working in Saudi Arabia Excellent resource for all those labor, immigration, and practical questions that are hard to find reliable answers to, mashaa'Allah.
Desert Diaries Making Hijrah and Living in Jeddah
Hijrah to Allah A blog by a sister who has made hijrah to different places and now is in Saudi Arabia. She posts information about lesser known jobs, mashaa'Allah, and is open to questions.
Moments in Madinah This blog covered a span of about a year, as the sister and her family left last summer. It proved quite helpful to us, mashaa'Allah. It hasn't been updated in 11 months, since they left Madinah.
Guide to the Kingdom of Saudi Arabia This hasn't been updated in 3 years, so the information, in some cases, is outdated.
This should keep you all busy and answer many of the questions you have far better than me. Enjoy!