1. I don't think you need that. Just give them your address same as your friend. It is enough for you to get all the materials you need.
2. There is a specific instruction about that in the KIT. I can't remember it now. Sorry, maybe you check it again.
3. N/A or 0
4. Just put all the money you spent on rent. About the inverstment expense, it is EXPENSE, not the money you put in. Sth. like commitions, transaction fee.
It is all personal advice. The best way for you is to call CIC call center.