Hello!
1. Some of the questions (like when describing the relationship) suggest using an extra sheet of paper if you don't have enough space on the application form. Some people discuss these things in a few sentences, but to be on the safe side I think it's better to go into detail. We included some 15 extra pages where we went into detail about how we got engaged, and how our relationship developed. We didn't have a wedding, so we felt it was necessary to explain everything thoroughly.
2. Proof of relationships can include many things! Such as:
- Photos: wedding, visits, vacations, with family, holidays, special occasions, etc.
- Gifts given to each other.
- Cards given by family members, perhaps for special occasions, or to congratulate you on being married.
- Emails exchanged by you and your spouse, or even between you and friends where you discuss the relationship.
- Anything else you can think of that might go to show you are a real couple. For example, my husband and I have matching tattoos, so I included photos of these!
3. I wouldn't worry about the engagement so much, as long as you have photos from the wedding I think you should be fine. I think there's a question on the form about the engagement, so just explain how it happened and you should be ok
4. I'm not sure exactly what you mean by this, but all of the sponsorship and application forms are available for download on CIC's website.
Good luck!