If you are going to start loading quite a few fonts, font book is not the best app, the free font explorer is much much better
http://www.linotype.com/fontexplorerX
If you really want to manage your fonts well I suggest the suitcase (another font management tool - not free) guide (the guide is free)
dl.extensis.com/downloads/ SC/EN/P/Fonts_Best_Practices_in_OSX.pdf
Just substitute use Suitcase with use Linotype FontExplorer