I think every step is OK. You can find detailed steps on the DARTEL guide by
From his web site:
Dear DARTEL/SPM users,
I am running DARTEL for the first time and I would really appreciate
if you could check what I am doing is not wrong.
I want to transform DARTEL results to MNI space.
To this aim I am following this way. Is it ok?
Flow field: I select the u_rc1*.nii file of the subject
Time steps: 64
parameter file: I select the template_sn.mat I got from the
affine transform of DARTEL template to MNI space
voxel size: NaN
bounding box: NaN
Apply to: I select the rc1*.nii file of the same subject
Thanks in advance for your help