Hello,
How did you install Squid? Using your package manager, downloaded source and compiled, ...? I'm not sure if it still applies but last time I installed it, I had to compile it from source in order to have SSL support. If you're only looking for configuration, did you already have a look at these pages?
Reverse proxy
Squid reverse proxy mode.
They're the best to get started in my opinion.
Kind regards,
Eric