I am a brand new beekeeper in Northern Michigan.  Got two active hives last year mid-summer from friends who were moving. The hives had not been tended in well over a year so I had no idea about where queens were/how old they were, etc...

Neither hive made it through the winter.  Pretty sure one was invaded by a mouse, despite my best efforts to put adequate screening over the opening.  Not sure what happened to the other hive... 

Anyway...I am preparing to get new bees from a local source and want to prepare their home properly.  There is still a lot of honey left in the hives from last year-how much should I leave for the new bees? Is it worth extracting any of it?