What happens the next day?

There aren't buses from ALL compounds to ALL work locations (for instance, there are no buses from Dhahran to Jeddah) but in most cases, the company will put you in a compound that does have a bus to the majority of work locations in that area. Although sometimes you have to take two buses to arrive at your destination.

But at least in the last two departments I've worked for, they have always assigned someone to both meet the new arrivals at the airport and to get them to work on their first day.