First you need to do a bit of research
Is it a proper hive or a wild bee nest ( I guess its a wild nest)
What sort of bees are they
If you watch the bees are they entering one entrance or several ( helps identify what bees)?, go up to the entrance 2-3 foot away but do not cast a shadow over the entrance or stand in the way of the main flight path. Best to do so when you havent been drinking are not sweaty or been using deodorants as bees dont like it. Have a look at the bees and see if you can identify what they are
this site might help
http://www.wgbka.org.uk/Bee_Identification.shtml
If they are honey bees google your local beekeepers and they should be able to help.