Hi there! I can give some fantastic resources for your project. As for "becoming a Shaman," it's not really a choice.
Alberto Villoldo's books are great (Dance of the Four Winds
and Island of the Sun are great
. Books with more "instruction" are Shama, Healer, Sage
; Courageous Dreaming
; Mending The Past & Healing The Future With Soul Retrieval
Kristin Madden has some great books, too. I recommend The Book of Shamanic Healing
and Shamanic Guide to Death and Dying
. That last one helped me quite a bit during Hospice.
Internet resources include Apu Kuntur (http://www.kondor.de
On the anthropologic study of Shamanism, try The Strong Eye of Shamanism
by Robert E. Ryan.
by Lynn V. Andrews is a great read and very inspiring. It's also a fantastic book for hinting at the dangers of Shamanism to initiates.
Ted Andrews teaches aspects of Shamanism in most of his books, though he rarely gives reference to it.
This all being said, it is important to give respect to the world of Shamanism. It is a dangerous study. It was said that a true Shaman would never call themselves a Shaman. There are a few reasons for this. 1) The respect they had of the word and 2) There are many frauds out there, and while the frauds flaunted their "powers," true Shamans remained meek and did not flaunt the spirit world, knowing instead the power of the universe to bring those who are in need to them.
Again, there are many dangers to studying Shamanism. I've seen people worthy of the psych ward because they were opening doors: ripped "veils," possession, life chaos. It is always best to start learning from a protective source. Guides, angels, gods, whatever you work with. Shamanism is, in essence, speaking with the spirit realm, and then the ability to walk the Otherworlds. From there, there are things you can do (soul retrieval, healing, shapeshifting, etc) that Shamans are known for. If you are seriously studying, seek first to know your allies, and create a strong relationship with them. They will protect and teach you, and let you know what you should and should not do, and they provide a landmark so that you know when you are in the presence of something good, or in the presence of something that may end up in possession.
Hope that helps.