As far as I am aware, there are no existing documents from the middle ages of the dance of the time.  Most of what is used dates from the Renaissance and later periods and some of what I have seen out there was simply made up.  Here are some of the best sites that I have found.

Dance - Primary source listings in year order.

Dance - Copies from Playford's Country Dancing Master.

Dance - RENDANCE dance index of Medieval Dance sources.