i use the chapter in the book i named above that shows how to use the "kidd&Kidd" classification system of glass beads. what you do is assign a series of numbers and letters, each which represent a certain characteristic of the bead. then you bing, google, etc. that sequence and try to find archaeological or bead research articles that feature that bead. it takes time, has worked very well for some beads i've found but of course if the bead isn't found in the USA and recorded by a researcher you'll probably have little luck identifying it.
i just binged "Kidd & Kidd bead typology" and the second article from the top is a pdf of the Kidd & Kidd system. once you assign a correct sequence to your bead, then you bing, etc. that sequence. also there are a vast number of archaeology site reports and books you might look through, such as academia.net. the key to researching a bead is to have the proper kidd sequence.