switching nginx-apache to using SSL

I am having web-site nginx port 80 with proxy_pass http://10.7.1.3:80 to apache port 80
how to switch all this to 443 port with using SSL certificate?
when i make config for SSL certificate working with nginx 443 it is ok but web-site on apache 443 port is not seen

How to do this right way?

should i use streams
Please give example for configuring

Is it config would work 443 port nginx to 443 apache
where should i place certificates

Appreciate any help
You have a great stuff made (mean nginx)