The publishers' websites themselves should always be consulted and their own preferences followed.
There are surprisingly few websites dedicated to information about publishing your thesis – this may be the only one as yet.
Good books on the topic are:
Anthony Haynes, Writing Successful Academic Books (Cambridge: Cambridge University Press, 2010)
William Germano, Getting it Published: A Guide for Scholars and Anyone Else Serious about Books (Chicago and London: University of Chicago Press, 2001)
Eleanor Harman and Ian Montagnes, eds., The Thesis and the Book (Toronto and Buffalo: University of Toronto Press, 1976)
Beth Luey, Handbook for Academic Authors, 4th ed. (Cambridge: Cambridge University Press, 2002)