The Element Encyclopedia of 5000 Spells; The Ultimate Reference for the Magical Arts
By: Judika Illes
The New Encyclopedia of the Occult
By: John Michael Greer
Don't forget to visit your local library or occult shop for other sources as well.
Books are fantastic, and I completely endorse your decision to find some to help you in your pursuits. BUT: the internet also has a huge variety of information for free, that includes pdf documents, blogs, and just general websites; always remember to check their sources though
Advice for problems with parents:
Remember, you live under their roof; if they are uncomfortable with something, don't make it obvious you practice it. As you get older, you may not want to anways. But if you grow up, and this turns out to be what you love doing, then learn to subtly bring it up so one day you can fully tell them you are a practicioner. Considering you are most likely young, don't jump the gun just yet and scream it atop the mountains, wait patiently and let time take it's course.
Good luck and blessings,