Schools in the UAE are very expensive, and many of them are not up to standards compared to home. Before bringing them here and enrolling them, do some research. There is a list of evaluated schools in Dubai, the results of which are published each year in the newspapers. It should be available somewhere on the web as well.
Settling into a school should be no problem for them. Kids come from allover the world. Your child's friends will inevitably be expats too. People come and leave all the time, so your kids' friends will often change by the schoolyear. Sports clubs, musical lessons, dancing, language or religion classes etc. are all available. Sometimes offered by the school, sometimes private.
Social networks depend on the parents - you will have to drive your kids around. Distances are huge and the only means of getting anywhere is by car. You may be lucky and have some nice neighbours around where you live, with kids about the same age as your own.