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Have you ever played Dragon Age Origins? It similar in the that there are a number of different character selections and then during the game a number of choices and event arcs based on how you started and what you chose to do afterwards.
If you're like me where playing the game again isn't realistic, then do your research on what choices give the most interesting story arc and follow it.
For example in DA:O, I was told the Dwarf noble had the most interesting storyline, and that the thief class was the most fun, so I that is what I chose.