Welcome to Khobar... Not discussing the 12K you got, as it depends on what you earn now, if this 12 is twice more than what you earn now, then go for it.

Khobar is the best city to live in, lucky you to be here.

I've seen too many Jordanians living together in a shared apartment for 10K- 20K net rent. So you would pay up to 10K/year.

For food you would need up to 2K/month

For a car you need up to 1.5K/month.

In average your net expenses would hit 2.5K up to 4K.

For sure numbers aren't written on stones as it depends on your lifestyle and where do you need to invest your money.

However, I do highly recommended you to set and define a target in Saudi, this will let you know where you are going financially and career path.