Are you talking left seat or right seat? Assignment will be based on their needs at the time, for example if they hire anymore FO's, they will go to the A330.
Medical in Kingdom only.
There are two medicals required for new hires. The first is the pre-hire medical which can be done in several places (US, UK, KSA). The initial GACA medical must be done at Saudia Medical in Jeddah. GACA renewals can be done with anyone of a number private examiners.