http://www.fragrantica.com/groups/ this is a really great introduction to olfactive groups.
http://www.amazon.com/Perfumes–Z-Guide-Luca-Turin/dp/0143115014/ref=sr_1_3?s=books&ie=UTF8&qid=1425240357&sr=1-3&keywords=perfume This also is quite useful.
Otherwise I’d just ask some questions on fragrantica