Bloom, walaal Congrats on your new post.
Life in Dubai is less expensive than that of the UK/Europe. If you intend to work there for the long term ie more than 10 years than perhaps you should consider purchasing a property unless your employer intends to pay for your rent. Property in UAE is well below market value in comparison to existing markets ie UK.
Although not essential it would be beneficial to learn Arabic.
Having a UK passport will open few more doors for you compare to Asian/African one. Transport is improving with the tram lines under construction and taxi fares are reasonable. Lakiin expect rush hour traffic which is unpleasant under such temperature particularly June-August period.
I have been to Dubai 3 times and each time the local were very friednly and helpful. The Job market is currently booming due to investment pouring into the country and regeneration.
There is a flux of Somali from Europe and America migrating to UAE hence social life is bound to be lively.
I too insha Alah hope to move and work there.