Perhaps worth mentioning that we have had Schengen visa before and have visited Spain but that was way back in 2016.
1) Are dummy flight tickets and insurance acceptable form of proof of travel e.g, those bought from third party weblink removed by moderator?
2) We were hoping to visit Spain multiple times on short visits (2-3 days each time) for next few months. Can we hope to get a multiple entry visa on this basis? If so, what is the best way to communicate this to the consulate?
3) Assuming #2 is not possible, how long can I expect the visa to be active. If we provide proof of travel for say 10 days, will the VISA be issued will be for only those 10 days or can we expect it to be active for few more days so that we can re-adjust our travel dates if need be.
4) How soon can I expect the VISA to arrive?
5) For photocopies e.g passport all pages, will they accept a print out instead ?
6) Since my wife is unemployed, will it suffice if we submit last 6 months bank statements of both my account and our join account?
7) Also, because the delay between application submission and getting the visa appointment, our travel dates and hotel names mentioned in the application letter have changed. Can this be communicated in form of a covering letter?

9) For my wife and child, I had to create two separate applications using different email accounts and phone numbers as the system wasn't allowing me to book two separate appointments in case both the applications are added under same account and as family members. Strange, but I asked their help centre and they have given me a vague answer to try and do it through separate email accounts. Will this cause any problem for our applications to be considered as related?
10) Any other general tips.
Appreciate there are too many questions, but I'm keen to get all the requirements sorted to avoid disappointment. So, I will be grateful for any of your kind advice, thanks in advance!