When to write N/A to questions in the forms?

[LFifi]

I have some questions,
I'm a PR and I'm sponsoring my husband, I've never sponsored anyone before

in form 1344 in the sponsor eligibility assessment , question 9, "Have persons you previously sponsored or their family members received social assistance ... ?" should I check No or leave it blank and type N/A ??

in the checklist there's a point on medical examination, since we didn't have one yet, should I write N/A ?

and the question: Are you (the sponsor) a Canadian citizen living outside Canada? .. I'm a PR so do I right N/A or tick it and choose No ?

Thank you!