Advice about life for an expat

My (31F) and my partner (32M) are looking at moving to Saudi Arabia 🇸🇦 from England 🏴󠁧󠁢󠁥󠁮󠁧󠁿

Both of us work in finance and have started looking for jobs.

We are considering moving early next year (by March - he will probably go first and I will follow him shortly afterwards)

What parts are best for a couple working in finance?

What does an average couple spend monthly on living things such as rent, bills, food, transport, eating out, entertainment etc?

What is a decent amount of money for two people to live off comfortably?

Do we need cars or will public transport be fine?

We would like to start a family in the near future. Is there any area or consideration for this that we need to take into account?

Any tips or views would be greatly appreciated ☺️