I will give you some ideas based on my knowledge.
1. Sorry I don’t know but I think it’s ok if you have the proof that you do your business.
2. Contracts on mails => ok
2. You don’t need to have education in photography, you can get the point for education of any subjects.
I think the percent of process just base on the time we submit the document, because I submit around December last year, until end of March it's 21%, but I was confirmed to pass medical exam and be waiting for final decision.