Some "Noobie" Questions.

[Nanometer]

I have some outstanding questions and concerns regarding the 37VHR tune ability. And I would greatly appreciate any input.

Is the stock O2 sensor adequate to get accurate A/F reading or is wideband needed?
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What ratio of A/F to shoot for throughout the rev range?
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Is there a need to remap ignition timing? Or should I use a pre-configured map and do a whole ecu flash? (and where could I get my hands on a preconfigured map)
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Is an EGT sensor needed?
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Are there any crucial tuning points there are to worry about that are not already listed?

I apologize if these are dumb questions, I am new around here <-- clearly.. and I have never built my own boosted car, so this will be my first(worked on others however... used to spend time in a tuner shop in California).