The documentation is extensive and you will come to rely on it. It is available online at http://www.iser.essex.ac.uk/ulsc/bhps/doc/. Volume A contains a very full description of the survey; Volume B has details on all the variables in all the files, with cross-referencing, access by record type (i.e., file) and with indexing by key word.
Today familiarise yourselves with Volume A from its table of contents (most of what you need to know about the survey is there), and spend some time with Volume B.
Explore the documentation and make sure you can find the information you need to conduct analyses.