Amazon.com: Mechanics of Flight (10th Edition) (9780582237407): A.C. Kermode: Books
This will sort you out.
Handling the big jets is also great, but more in tune with ATPL study.
Bob Tait will get you over the line, but certainly won't give you a comprehensive understanding of the subject.
Just ask Roxy "A heavy aeroplane will glide the same distance as a light aeroplane - no matter what"
Good luck with it. If you were further south I'd offer my services, but I'd probably confuse the hell out of you (and myself in the process).
GG