gap year commission 'more application questions' section help?

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Hi, I'm 17 (going into year 13 at school) and applying for a gap year commission. I'm at the 'More Application Questions' stage and have a few questions. I've spoken to everyone I know in the army, and have been into a recruitment office, but no-one knows much about the GYC, so was hoping you'd be able to provide some guidance. I'm not really sure what exactly I can do in the army during a GYC, so don't know what to put in the "ASPIRATIONS" section. Same goes for my regiment preference. However would it count against me if I left these options blank, and can I change them in the future? I intend to visit some regiments over summer, so should I save the 'more application questions until then', although it does say "It may help avoid delays in future" and "we'll need it during the application process."