In reply to Tom Ripley Mountain Guide:
There is a climbing guudebook: https://www.amazon.co.uk/Climbing-in-Oman/dp/3956110196/ref=asc_df_39561101... A few years old now and fairly basic, but it will provide more than enough to keep anyone busy. I am sure you would find lots more stuff online. The fb group "Climbing in Oman" is a good place for particular queries.
The French Pillar is the classic on the vast south face of Jebel Misht, Oman's main climbing attraction. It was too hot for us in December and we bailed early but I think it now gets climbed reasonably regularly. We thought the climbing was generally fairly serious, demanding general competence; certainly not the relative playground feel of, say, the Anti-Atlas. Though I think more cragging type stuff is getting developed and plenty of sport climbing even.
Probably the most memorable thing about Oman is just how incredibly hospitable people are. Sensible roadside camping was absolutely fine five years ago.