Most people will be arriving by train, note that the correct train station to arrive at is Coventry (i.e., not Warwick station!) There are then regular busses from outside the station to the university campus. The bus only accepts exact change, or more conveniently, contactless card payment.
The provided accommodation will be in the vicinity of the campus.
There are 2 pubs on the campus site, "The Dirty Duck" and "Varsity". There is also a large grocery store "Rootes".