New SSL and request for CSR

I am creating a node.js API server and i want to make it listen only to HTTPS requests. I managed to set up a self signed SSL and hit it but now i need to install a SSL that I have bought. The problem is that I have never used a real SSL and I have some questions on this.

1. How can I generate the CSR? Do I need to contact goDaddy or whom? Which domain provider should I contact?

2. My web server is a windows 2012 server in which I run some other Services that must keep on using HTTP. They run on specific ports. Do i need to make an changes on them?

3. Or do I have to adjust just my node.js server as I did with my self signed SSL? My node server will also run on specific port.

via SebKapellas