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Fortunately for you a few basic internet search for topics related to alternating current power generation should give you such an overwhelming amount of information to read though you will busy with it for days. Keywords to use are 'How does' followed by whatever topic you are looking for ending with 'Work?'. The rest is just reading and watching videos.Any good PDF on this?
Also, his forum, https://forum.allaboutcircuits.com would be a good place to start given they have a excellent archive of study guides and educational reference material.
Personally if I was you I would take a look at how common automotive alternators are converted to permanent magnet units. Many of the DIY tutorials on that conversion give a pretty good explanation of how three phase power is generated and are very relevant to the DIY home built generator design concepts.