Travel Requirements for Spain/Schengen [duplicate]

I intend to travel to Spain using Schengen visa. From my research, I found out I must show I have EU77.07/day available during my stay, I must have a return ticket and I must have insurance coverage during my stay. Is this correct?

Moreover, the return ticket requirement is clear, but I was not able to find anything substantial on how I can prove the availability of EU77.07 per day. Do I show a copy of my account balance for this total?

For the insurance coverage: I was not able to find anything that seemed reliable. Can anyone suggest on any plan or the conditions that must be met for the required coverage?

EDIT 12/17/19: I am in the list of countries that do not require a visa application. Sorry for not being clear. And I don't intend to go anywhere outside of Spain while there. Thank you all for your comments. I was in Spain when I wrote my profile, thought would stay there but things changed and I am not there anymore.

EDIT2: Thank you all, thanks for your comments, sorry for not being clear. According to my research, while not needing a visa per se. My doubts are strictly about the specs on the requirements to certify my ability to support myself to the tune of $EU77.07 /Day and show health coverage: How do I certify I have the required funding and what type of specs are need for the health certificate?