Where would i find a template for a password-protected mermbers-only website?

[just "JR"]

Your way of asking the question tells me that your skills at web development are rather limited, and, hence, that a site such as you want to develop is, most likey, way above your head...
You can certainly try yourself, but your chances of success are seriously compromised, right at the start.
You would be better off asking a professional to develop it for you, but expect to pay the price!
You ask what you would need:
- A domain,
- A server (preferably a LAMP server)
- A good graphic program, such as Photoshop
- Good artisitic skills
- Good marketing skills
- Coding skills and experience: HTML, CSS, javascript, php, mysql, ajax. This is the hard part. You can learn HTML in a couple of weeks, but mastering Php can take you years...
Good luck!