Pulled toward Shamanism yet wondering if you should study about wicca......
We could throw a bunch of book titles at you and tell you to read read read, but that's not all that helpful at this stage.
Rather, go to Wikipedia and look up "Shamanism" and "Wicca" and have a look at the information provided on both. It may help you understand what each is and help you determine the direction of your interest. You can get a feel of any number of faiths or belief systems this way to help you determine just what's out there for established paths.
No matter what you read however, it still comes down to what you see as a truth, what you can believe in and have faith in, what resonates in your heart.