Dear Nina,
Go with "Few subjects" despite having many; this allows to select one flow field and the corresponding EPI images for each of the subjects. For the other two questions, if you have "standard" resolution (e.g. something like 3x3x3) I would just go with the default ones from "Normalise: Estimate & Write" (e.g. voxel size 2x2x2). Dartel doesn't increase the spatial resolution of the EPIs, it's "just" meant to lead to a better within-subject registration.
Best
Helmut
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