With huge respect to Ken, I beg to differ just a little on the setup issue.
I agree that generally, once all is as it should be, an 'ukulele should require little in the way of attention except cleaning, the occasional string change, and constant playing.
That said, IMHO some new ukes most certainly need a setup if they are to play well and in tune. The most common problem I see is high action at the nut. In bad cases this will cause poor intonation on notes at lower frets and the instrument simply will not play in tune at all positions.
High action is not a fault, it is just the common default situation of a uke that is awaiting setup to the owners personal taste and playing style.