I’m trying to enable https://mysite.com on my Ubuntu 11.04/Apache 2
I followed several guides online, but I still cannot access https://mysite.com
The guides mentioned getting certificates from CA, does that mean I have to register somewhere?
Or, can I simply redirect all https traffic to http?
Yes. You need to get and install an SSL certificate.
The whole point of SSL is that a trusted third party verifies your identity.
You are going to need to read up on SSL or hire someone.
Good luck