Put forward all your points- Clear everything, which need to cleared. Any small information can lead to a big misunderstanding in future.
Do not leave anything to imagination. Clear out any doubts or questions you have about anything right at the outset, preferably on the first day itself. It could be anything from late working hours, social life, habits.
Remember to tell everything in a casual and preferably, funny way, so that it doesn't sound too heavy to digest.
