For using the wideband o2, you can set the target voltage the MS will shoot for when you are driving. Stoich(14.7:1) is roughly 2.470 volts, which is where you set it for stoich. If you want it a bit richer, then you need to lower that number, to lets say around 2.1 volts. Leaner is above 2.47 volts. Higher o2 voltage is leaner, lower o2 voltage is richer. Dont use the target A/F tables until you get in a decent tune in the VE table.

A good A/F for idle can vary, but it will be smoother when its richer than stoich. 13.5-14.0 is good. Normal driving should be stoich 14.7, and low boost(0-5 psi), can be 13.5, 5-10 psi should be around 12.5, and 10-12 psi around 12.0, and 12+ should be 11.5-11.7. That should be a good starting point.